CUB-120: design PostgreSQL schema for Control Center Go backend

backend/internal/models/models.go

@@ -0,0 +1,106 @@
+// Package models defines the database entities for the Control Center Go backend.
+// Structs map 1:1 to the PostgreSQL schema defined in backend/migrations/.
+package models
+
+import (
+	"time"
+
+	"github.com/jackc/pgx/v5/pgtype"
+)
+
+// AgentStatus represents the possible lifecycle states of an agent.
+type AgentStatus string
+
+const (
+	AgentStatusActive  AgentStatus = "active"
+	AgentStatusIdle    AgentStatus = "idle"
+	AgentStatusThinking AgentStatus = "thinking"
+	AgentStatusError   AgentStatus = "error"
+	AgentStatusOffline AgentStatus = "offline"
+)
+
+// Agent represents a registered agent and its current state.
+type Agent struct {
+	ID           pgtype.UUID `db:"id" json:"id"`
+	Name         string      `db:"name" json:"name"`
+	Status       AgentStatus `db:"status" json:"status"`
+	Task         *string     `db:"task" json:"task,omitempty"`
+	Progress     int32       `db:"progress" json:"progress"`
+	SessionKey   *string     `db:"session_key" json:"session_key,omitempty"`
+	Channel      *string     `db:"channel" json:"channel,omitempty"`
+	LastActivity time.Time   `db:"last_activity" json:"last_activity"`
+	CreatedAt    time.Time   `db:"created_at" json:"created_at"`
+	UpdatedAt    time.Time   `db:"updated_at" json:"updated_at"`
+}
+
+// SessionStatus represents the possible states of an agent session.
+type SessionStatus string
+
+const (
+	SessionStatusRunning    SessionStatus = "running"
+	SessionStatusCompleted  SessionStatus = "completed"
+	SessionStatusCrashed    SessionStatus = "crashed"
+	SessionStatusTerminated SessionStatus = "terminated"
+)
+
+// Session tracks an agent session over time.
+type Session struct {
+	ID        pgtype.UUID  `db:"id" json:"id"`
+	AgentID   pgtype.UUID  `db:"agent_id" json:"agent_id"`
+	StartedAt time.Time    `db:"started_at" json:"started_at"`
+	EndedAt   *time.Time   `db:"ended_at" json:"ended_at,omitempty"`
+	Status    SessionStatus `db:"status" json:"status"`
+}
+
+// TaskLogStatus represents the possible states of a task log entry.
+type TaskLogStatus string
+
+const (
+	TaskLogStatusPending   TaskLogStatus = "pending"
+	TaskLogStatusRunning   TaskLogStatus = "running"
+	TaskLogStatusCompleted TaskLogStatus = "completed"
+	TaskLogStatusFailed    TaskLogStatus = "failed"
+	TaskLogStatusCancelled TaskLogStatus = "cancelled"
+)
+
+// TaskLog records a historical task assigned to an agent.
+type TaskLog struct {
+	ID            pgtype.UUID  `db:"id" json:"id"`
+	AgentID       pgtype.UUID  `db:"agent_id" json:"agent_id"`
+	Task          string       `db:"task" json:"task"`
+	Status        TaskLogStatus `db:"status" json:"status"`
+	StartedAt     time.Time    `db:"started_at" json:"started_at"`
+	CompletedAt   *time.Time   `db:"completed_at" json:"completed_at,omitempty"`
+	ErrorMessage  *string      `db:"error_message" json:"error_message,omitempty"`
+}
+
+// ProjectStatus represents the possible states of a project.
+type ProjectStatus string
+
+const (
+	ProjectStatusPlanned     ProjectStatus = "planned"
+	ProjectStatusInProgress  ProjectStatus = "in_progress"
+	ProjectStatusCompleted   ProjectStatus = "completed"
+	ProjectStatusPaused      ProjectStatus = "paused"
+	ProjectStatusCancelled   ProjectStatus = "cancelled"
+)
+
+// Project represents a project managed by the Control Center.
+type Project struct {
+	ID          pgtype.UUID  `db:"id" json:"id"`
+	Name        string       `db:"name" json:"name"`
+	Description *string      `db:"description" json:"description,omitempty"`
+	Status      ProjectStatus `db:"status" json:"status"`
+	AgentID     *pgtype.UUID `db:"agent_id" json:"agent_id,omitempty"`
+	CreatedAt   time.Time    `db:"created_at" json:"created_at"`
+	UpdatedAt   time.Time    `db:"updated_at" json:"updated_at"`
+}
+
+// AgentEvent represents an event in the agent lifecycle or telemetry stream.
+type AgentEvent struct {
+	ID        pgtype.UUID `db:"id" json:"id"`
+	AgentID   pgtype.UUID `db:"agent_id" json:"agent_id"`
+	EventType string      `db:"event_type" json:"event_type"`
+	Payload   *map[string]interface{} `db:"payload" json:"payload,omitempty"`
+	CreatedAt time.Time   `db:"created_at" json:"created_at"`
+}

backend/migrations/001_initial_schema.down.sql

@@ -0,0 +1,9 @@
+-- Migration: 001_initial_schema (down)
+-- Description: Reverts the core Control Center database schema.
+
+-- Drop in reverse dependency order to avoid FK conflicts
+DROP TABLE IF EXISTS agent_events;
+DROP TABLE IF EXISTS task_logs;
+DROP TABLE IF EXISTS sessions;
+DROP TABLE IF EXISTS projects;
+DROP TABLE IF EXISTS agents;

backend/migrations/001_initial_schema.up.sql

@@ -0,0 +1,97 @@
+-- Migration: 001_initial_schema
+-- Description: Creates the core Control Center database schema.
+
+-- Enable UUID extension
+CREATE EXTENSION IF NOT EXISTS "uuid-ossp";
+
+-- ============================================
+-- Table: agents
+-- ============================================
+CREATE TABLE agents (
+    id            UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
+    name          TEXT NOT NULL,
+    status        TEXT NOT NULL DEFAULT 'idle'
+        CHECK (status IN ('active', 'idle', 'thinking', 'error', 'offline')),
+    task          TEXT,
+    progress      INT NOT NULL DEFAULT 0
+        CHECK (progress >= 0 AND progress <= 100),
+    session_key   TEXT,
+    channel       TEXT,
+    last_activity TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    created_at    TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at    TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+COMMENT ON TABLE agents IS 'Registered agents and their current state';
+COMMENT ON COLUMN agents.status IS 'Agent lifecycle status: active, idle, thinking, error, offline';
+
+-- ============================================
+-- Table: sessions
+-- ============================================
+CREATE TABLE sessions (
+    id         UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
+    agent_id   UUID NOT NULL,
+    started_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    ended_at   TIMESTAMPTZ,
+    status     TEXT NOT NULL DEFAULT 'running'
+        CHECK (status IN ('running', 'completed', 'crashed', 'terminated')),
+    CONSTRAINT fk_sessions_agent
+        FOREIGN KEY (agent_id) REFERENCES agents(id)
+        ON DELETE CASCADE
+);
+
+COMMENT ON TABLE sessions IS 'Agent session history';
+
+-- ============================================
+-- Table: task_logs
+-- ============================================
+CREATE TABLE task_logs (
+    id             UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
+    agent_id       UUID NOT NULL,
+    task           TEXT NOT NULL,
+    status         TEXT NOT NULL DEFAULT 'pending'
+        CHECK (status IN ('pending', 'running', 'completed', 'failed', 'cancelled')),
+    started_at     TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    completed_at   TIMESTAMPTZ,
+    error_message  TEXT,
+    CONSTRAINT fk_task_logs_agent
+        FOREIGN KEY (agent_id) REFERENCES agents(id)
+        ON DELETE CASCADE
+);
+
+COMMENT ON TABLE task_logs IS 'Historical record of tasks assigned to agents';
+
+-- ============================================
+-- Table: projects
+-- ============================================
+CREATE TABLE projects (
+    id          UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
+    name        TEXT NOT NULL,
+    description TEXT,
+    status      TEXT NOT NULL DEFAULT 'planned'
+        CHECK (status IN ('planned', 'in_progress', 'completed', 'paused', 'cancelled')),
+    agent_id    UUID,
+    created_at  TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at  TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    CONSTRAINT fk_projects_agent
+        FOREIGN KEY (agent_id) REFERENCES agents(id)
+        ON DELETE SET NULL
+);
+
+COMMENT ON TABLE projects IS 'Projects managed by the Control Center';
+
+-- ============================================
+-- Table: agent_events
+-- ============================================
+CREATE TABLE agent_events (
+    id         UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
+    agent_id   UUID NOT NULL,
+    event_type TEXT NOT NULL,
+    payload    JSONB,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    CONSTRAINT fk_agent_events_agent
+        FOREIGN KEY (agent_id) REFERENCES agents(id)
+        ON DELETE CASCADE
+);
+
+COMMENT ON TABLE agent_events IS 'Event stream for agent lifecycle and telemetry';

backend/migrations/002_add_indexes.down.sql

@@ -0,0 +1,20 @@
+-- Migration: 002_add_indexes (down)
+-- Description: Remove all indexes added in 002_add_indexes.
+
+DROP INDEX IF EXISTS idx_agents_status;
+DROP INDEX IF EXISTS idx_agents_last_activity;
+DROP INDEX IF EXISTS idx_agents_created_at;
+
+DROP INDEX IF EXISTS idx_sessions_agent_id;
+DROP INDEX IF EXISTS idx_sessions_status;
+DROP INDEX IF EXISTS idx_sessions_started_at;
+
+DROP INDEX IF EXISTS idx_task_logs_agent_started;
+DROP INDEX IF EXISTS idx_task_logs_status;
+
+DROP INDEX IF EXISTS idx_agent_events_agent_created;
+DROP INDEX IF EXISTS idx_agent_events_event_type;
+
+DROP INDEX IF EXISTS idx_projects_status;
+DROP INDEX IF EXISTS idx_projects_agent_id;
+DROP INDEX IF EXISTS idx_projects_created;

backend/migrations/002_add_indexes.up.sql

@@ -0,0 +1,25 @@
+-- Migration: 002_add_indexes
+-- Description: Add performance indexes for common query patterns.
+
+-- agents: status filtering, activity ordering
+CREATE INDEX idx_agents_status        ON agents(status);
+CREATE INDEX idx_agents_last_activity ON agents(last_activity DESC);
+CREATE INDEX idx_agents_created_at    ON agents(created_at DESC);
+
+-- sessions: agent session lookups, active session checks
+CREATE INDEX idx_sessions_agent_id    ON sessions(agent_id);
+CREATE INDEX idx_sessions_status      ON sessions(status);
+CREATE INDEX idx_sessions_started_at  ON sessions(started_at DESC);
+
+-- task_logs: agent task history, chronological ordering
+CREATE INDEX idx_task_logs_agent_started ON task_logs(agent_id, started_at DESC);
+CREATE INDEX idx_task_logs_status        ON task_logs(status);
+
+-- agent_events: event stream queries
+CREATE INDEX idx_agent_events_agent_created ON agent_events(agent_id, created_at DESC);
+CREATE INDEX idx_agent_events_event_type    ON agent_events(event_type);
+
+-- projects: status filtering, agent assignment
+CREATE INDEX idx_projects_status   ON projects(status);
+CREATE INDEX idx_projects_agent_id ON projects(agent_id);
+CREATE INDEX idx_projects_created  ON projects(created_at DESC);

frontend/.dockerignore

@@ -0,0 +1,33 @@
+# Dependencies
+node_modules/
+npm-debug.log*
+yarn-error.log
+
+# Build output (rebuilt in container)
+dist/
+out-tsc/
+
+# Angular cache
+.angular/cache/
+
+# IDE
+.idea/
+.vscode/
+*.sublime-workspace
+
+# OS files
+.DS_Store
+Thumbs.db
+
+# Git
+.git/
+.gitignore
+
+# Docker
+Dockerfile
+.dockerignore
+
+# Misc
+coverage/
+tmp/
+*.log

frontend/Dockerfile

@@ -0,0 +1,38 @@
+# ============================================================
+# Control Center Frontend — Multi-stage Docker Build
+# Angular 21 + nginx for static serving + API proxy
+# ============================================================
+
+# --- Build Stage ---
+FROM node:22-slim AS builder
+
+WORKDIR /app
+
+# Install dependencies first (layer caching)
+COPY package.json package-lock.json ./
+RUN npm ci
+
+# Copy source and build production bundle
+COPY . .
+RUN npm run build
+
+# --- Runtime Stage ---
+FROM nginx:1.27-alpine AS runtime
+
+# Remove default nginx config
+RUN rm /etc/nginx/conf.d/default.conf
+
+# Copy custom nginx config
+COPY nginx.conf /etc/nginx/conf.d/default.conf
+
+# Copy built Angular app from builder stage
+COPY --from=builder /app/dist/frontend/browser /usr/share/nginx/html
+
+# Expose HTTP port
+EXPOSE 80
+
+# Health check — confirm nginx is serving
+HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
+  CMD wget -qO- http://localhost/ || exit 1
+
+CMD ["nginx", "-g", "daemon off;"]

frontend/angular.json

@@ -56,7 +56,8 @@
             ],
             "stylePreprocessorOptions": {
               "includePaths": [
-                "src"
+"src",
+                "src/styles"
               ]
             }
           },

frontend/nginx.conf

@@ -0,0 +1,54 @@
+server {
+    listen 80;
+    server_name _;
+
+    root /usr/share/nginx/html;
+    index index.html;
+
+    # Gzip compression
+    gzip on;
+    gzip_vary on;
+    gzip_proxied any;
+    gzip_comp_level 6;
+    gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript image/svg+xml;
+
+    # Cache static assets (Angular uses content hashes)
+    location /assets/ {
+        expires 1y;
+        add_header Cache-Control "public, immutable";
+    }
+
+    # Cache hashed JS/CSS bundles
+    location ~* \.(js|css)$ {
+        expires 1y;
+        add_header Cache-Control "public, immutable";
+    }
+
+    # Proxy API requests to backend
+    location /api/ {
+        proxy_pass http://backend:8080/api/;
+        proxy_http_version 1.1;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+    }
+
+    # Proxy SignalR WebSocket connections to backend
+    location /hubs/ {
+        proxy_pass http://backend:8080/hubs/;
+        proxy_http_version 1.1;
+        proxy_set_header Upgrade $http_upgrade;
+        proxy_set_header Connection "upgrade";
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+        proxy_read_timeout 86400;
+    }
+
+    # Angular SPA — all other routes fall back to index.html
+    location / {
+        try_files $uri $uri/ /index.html;
+    }
+}

frontend/src/app/app.html

@@ -1,344 +1 @@
-<!-- * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * -->
+<router-outlet />
-<!-- * * * * * * * * * * * The content below * * * * * * * * * * * -->
-<!-- * * * * * * * * * * is only a placeholder * * * * * * * * * * -->
-<!-- * * * * * * * * * * and can be replaced.  * * * * * * * * * * -->
-<!-- * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * -->
-<!-- * * * * * * * * * Delete the template below * * * * * * * * * -->
-<!-- * * * * * * * to get started with your project! * * * * * * * -->
-<!-- * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * -->
-
-<style>
-  :host {
-    --bright-blue: oklch(51.01% 0.274 263.83);
-    --electric-violet: oklch(53.18% 0.28 296.97);
-    --french-violet: oklch(47.66% 0.246 305.88);
-    --vivid-pink: oklch(69.02% 0.277 332.77);
-    --hot-red: oklch(61.42% 0.238 15.34);
-    --orange-red: oklch(63.32% 0.24 31.68);
-
-    --gray-900: oklch(19.37% 0.006 300.98);
-    --gray-700: oklch(36.98% 0.014 302.71);
-    --gray-400: oklch(70.9% 0.015 304.04);
-
-    --red-to-pink-to-purple-vertical-gradient: linear-gradient(
-      180deg,
-      var(--orange-red) 0%,
-      var(--vivid-pink) 50%,
-      var(--electric-violet) 100%
-    );
-
-    --red-to-pink-to-purple-horizontal-gradient: linear-gradient(
-      90deg,
-      var(--orange-red) 0%,
-      var(--vivid-pink) 50%,
-      var(--electric-violet) 100%
-    );
-
-    --pill-accent: var(--bright-blue);
-
-    font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
-      Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji",
-      "Segoe UI Symbol";
-    box-sizing: border-box;
-    -webkit-font-smoothing: antialiased;
-    -moz-osx-font-smoothing: grayscale;
-    display: block;
-    height: 100dvh;
-  }
-
-  h1 {
-    font-size: 3.125rem;
-    color: var(--gray-900);
-    font-weight: 500;
-    line-height: 100%;
-    letter-spacing: -0.125rem;
-    margin: 0;
-    font-family: "Inter Tight", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
-      Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji",
-      "Segoe UI Symbol";
-  }
-
-  p {
-    margin: 0;
-    color: var(--gray-700);
-  }
-
-  main {
-    width: 100%;
-    min-height: 100%;
-    display: flex;
-    justify-content: center;
-    align-items: center;
-    padding: 1rem;
-    box-sizing: inherit;
-    position: relative;
-  }
-
-  .angular-logo {
-    max-width: 9.2rem;
-  }
-
-  .content {
-    display: flex;
-    justify-content: space-around;
-    width: 100%;
-    max-width: 700px;
-    margin-bottom: 3rem;
-  }
-
-  .content h1 {
-    margin-top: 1.75rem;
-  }
-
-  .content p {
-    margin-top: 1.5rem;
-  }
-
-  .divider {
-    width: 1px;
-    background: var(--red-to-pink-to-purple-vertical-gradient);
-    margin-inline: 0.5rem;
-  }
-
-  .pill-group {
-    display: flex;
-    flex-direction: column;
-    align-items: start;
-    flex-wrap: wrap;
-    gap: 1.25rem;
-  }
-
-  .pill {
-    display: flex;
-    align-items: center;
-    --pill-accent: var(--bright-blue);
-    background: color-mix(in srgb, var(--pill-accent) 5%, transparent);
-    color: var(--pill-accent);
-    padding-inline: 0.75rem;
-    padding-block: 0.375rem;
-    border-radius: 2.75rem;
-    border: 0;
-    transition: background 0.3s ease;
-    font-family: var(--inter-font);
-    font-size: 0.875rem;
-    font-style: normal;
-    font-weight: 500;
-    line-height: 1.4rem;
-    letter-spacing: -0.00875rem;
-    text-decoration: none;
-    white-space: nowrap;
-  }
-
-  .pill:hover {
-    background: color-mix(in srgb, var(--pill-accent) 15%, transparent);
-  }
-
-  .pill-group .pill:nth-child(6n + 1) {
-    --pill-accent: var(--bright-blue);
-  }
-  .pill-group .pill:nth-child(6n + 2) {
-    --pill-accent: var(--electric-violet);
-  }
-  .pill-group .pill:nth-child(6n + 3) {
-    --pill-accent: var(--french-violet);
-  }
-
-  .pill-group .pill:nth-child(6n + 4),
-  .pill-group .pill:nth-child(6n + 5),
-  .pill-group .pill:nth-child(6n + 6) {
-    --pill-accent: var(--hot-red);
-  }
-
-  .pill-group svg {
-    margin-inline-start: 0.25rem;
-  }
-
-  .social-links {
-    display: flex;
-    align-items: center;
-    gap: 0.73rem;
-    margin-top: 1.5rem;
-  }
-
-  .social-links path {
-    transition: fill 0.3s ease;
-    fill: var(--gray-400);
-  }
-
-  .social-links a:hover svg path {
-    fill: var(--gray-900);
-  }
-
-  @media screen and (max-width: 650px) {
-    .content {
-      flex-direction: column;
-      width: max-content;
-    }
-
-    .divider {
-      height: 1px;
-      width: 100%;
-      background: var(--red-to-pink-to-purple-horizontal-gradient);
-      margin-block: 1.5rem;
-    }
-  }
-</style>
-
-<main class="main">
-  <div class="content">
-    <div class="left-side">
-      <svg
-        xmlns="http://www.w3.org/2000/svg"
-        viewBox="0 0 982 239"
-        fill="none"
-        class="angular-logo"
-      >
-        <g clip-path="url(#a)">
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-        </defs>
-      </svg>
-      <h1>Hello, {{ title() }}</h1>
-      <p>Congratulations! Your app is running. 🎉</p>
-    </div>
-    <div class="divider" role="separator" aria-label="Divider"></div>
-    <div class="right-side">
-      <div class="pill-group">
-        @for (item of [
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-          { title: 'Learn with Tutorials', link: 'https://angular.dev/tutorials' },
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-          { title: 'Angular DevTools', link: 'https://angular.dev/tools/devtools' },
-        ]; track item.title) {
-          <a
-            class="pill"
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-            target="_blank"
-            rel="noopener"
-          >
-            <span>{{ item.title }}</span>
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frontend/src/app/app.ts

@@ -5,7 +5,7 @@ import { RouterOutlet } from '@angular/router';
   selector: 'app-root',
   standalone: true,
   imports: [RouterOutlet],
-  template: `<router-outlet />`,
+  template: '<router-outlet />',
   styles: [`
     :host {
       display: block;

frontend/src/app/command-hub/components/agent-card/agent-card.component.html

@@ -2,11 +2,13 @@
 <!-- AgentCard — per spec Section 7.3                                            -->
 <!-- Integrates: Status Badge · Task Progress Bar · Quick‑Jump Button           -->
 <!-- Left‑border accent matches status color. role="article" + aria‑labels.     -->
+<!-- Enhanced: data-status attribute, elapsed time, design tokens.              -->
 <!-- ========================================================================== -->
 <article
   class="agent-card"
   role="article"
-  [attr.aria-label]="displayName + ' — ' + statusLabel()"
+  [attr.data-status]="status"
+  [attr.aria-label]="(displayName || agentId) + ' — ' + statusLabel()"
   [style.border-left-color]="statusBorderColor()"
   (click)="cardClick.emit(sessionKey)"
   appLongPress
@@ -32,19 +34,20 @@
   </div>
 
   <!-- ── Body: current task ── -->
-  <div class="agent-card__body" *ngIf="task || status === 'error'">
+  <div class="agent-card__body" *ngIf="task || isError()">
     <p
       class="agent-card__task"
-      [attr.aria-label]="'Current task: ' + (status === 'error' ? errorMessage : task)"
+      [class.agent-card__task--error]="isError()"
+      [attr.aria-label]="'Current task: ' + (isError() ? errorMessage || task : task)"
     >
-      {{ status === 'error' ? errorMessage || task : task }}
+      {{ isError() ? errorMessage || task : task }}
     </p>
   </div>
 
   <!-- ── Task Progress Bar ── -->
   <div
     class="agent-card__progress"
-    *ngIf="progress > 0 && status !== 'error'"
+    *ngIf="showProgress()"
     [attr.aria-label]="'Task progress: ' + progress + '%'"
   >
     <mat-progress-bar
@@ -55,6 +58,16 @@
     <span class="agent-card__progress-label text-mono">{{ progress }}%</span>
   </div>
 
+  <!-- ── Elapsed Time ── -->
+  <div
+    class="agent-card__elapsed"
+    *ngIf="taskElapsed && isActiveLike()"
+    [attr.aria-label]="'Elapsed: ' + taskElapsed"
+  >
+    <mat-icon aria-hidden="true" class="agent-card__elapsed-icon">schedule</mat-icon>
+    <span class="text-mono">{{ taskElapsed }}</span>
+  </div>
+
   <!-- ── Footer: channel + last activity + quick‑jump ── -->
   <div class="agent-card__footer">
     <div class="agent-card__meta">

frontend/src/app/command-hub/components/agent-card/agent-card.component.scss

@@ -2,15 +2,18 @@
 // AgentCard — M3 tactical dark styling
 // Per spec Section 7.3: left‑border accent, status‑aware coloring,
 // responsive card layout with 320px min‑width.
+// Enhanced: data-status selectors, elapsed time, design token imports.
 // ============================================================================
 
+@use 'tokens' as tokens;
+
 .agent-card {
   display: flex;
   flex-direction: column;
-  min-width: var(--cc-card-min-width);
+  min-width: tokens.$cc-card-min-width;
-  padding: var(--cc-card-padding);
+  padding: tokens.$cc-card-padding;
   background-color: var(--cc-surface-container);
-  border-radius: var(--cc-card-border-radius);
+  border-radius: tokens.$cc-card-border-radius;
   border-left: 4px solid var(--status-offline); // default; overridden by [style]
   border-top: 1px solid var(--cc-outline);
   border-right: 1px solid var(--cc-outline);
@@ -56,11 +59,6 @@
   letter-spacing: 0.02em;
   text-transform: uppercase;
   color: var(--cc-on-surface);
-
-  // Per‑status background tints
-  .status-dot--active + & {
-    background-color: var(--status-active-bg);
-  }
 }
 
 .agent-card__status-label {
@@ -102,8 +100,7 @@
   color: var(--cc-on-surface);
   line-height: 1.4;
 
-  // Error messages get distinct styling
+  &--error {
-  .agent-card--error & {
     color: var(--status-error);
   }
 }
@@ -117,6 +114,7 @@
 }
 
 .agent-card__progress-label {
+  font-family: var(--cc-font-mono);
   font-size: 12px;
   font-weight: 500;
   color: var(--cc-on-surface-variant);
@@ -138,6 +136,23 @@
   }
 }
 
+// ── Elapsed Time ──
+.agent-card__elapsed {
+  display: flex;
+  align-items: center;
+  gap: 4px;
+  font-size: 12px;
+  color: var(--cc-on-surface-variant);
+  padding: 2px 0;
+}
+
+.agent-card__elapsed-icon {
+  font-size: 14px;
+  width: 14px;
+  height: 14px;
+  color: var(--status-thinking);
+}
+
 // ── Footer ──
 .agent-card__footer {
   display: flex;
@@ -161,7 +176,6 @@
   color: var(--cc-on-surface-variant);
 }
 
-.agent-card__channel-icon,
 .agent-card__channel .mat-icon {
   font-size: 14px;
   width: 14px;
@@ -177,7 +191,6 @@
 .agent-card__jump {
   flex-shrink: 0;
 
-  // Match M3 text button sizing
   .mat-mdc-button {
     min-width: 36px;
     padding: 0 8px;
@@ -192,11 +205,9 @@
 }
 
 // ── Status‑specific background tints for badge ──
-// We use the global status-dot classes from styles.scss and pair them
+// Using data-status attribute selectors for clean styling.
-// with contextual background-color overrides here.
 
-.agent-card[data-status="active"] .agent-card__badge,
+.agent-card[data-status="active"] .agent-card__badge {
-.agent-card .status-dot--active ~ .agent-card__badge {
   background-color: var(--status-active-bg);
 }
 
@@ -212,8 +223,22 @@
   background-color: var(--status-error-bg);
 }
 
+.agent-card[data-status="offline"] .agent-card__badge {
+  background-color: var(--cc-surface-container-high);
+}
+
+// ── Active‑like pulse on card border ──
+.agent-card[data-status="active"],
+.agent-card[data-status="thinking"] {
+  border-left-width: 4px;
+}
+
+.agent-card[data-status="error"] {
+  border-left-color: var(--status-error);
+}
+
 // ── Responsive ──
-@media (max-width: 599px) {
+@media (max-width: tokens.$cc-breakpoint-mobile) {
   .agent-card {
     min-width: unset;
     padding: 16px;

frontend/src/app/command-hub/components/agent-card/agent-card.component.ts

@@ -3,8 +3,12 @@ import {
   Component,
   EventEmitter,
   Input,
+  OnDestroy,
   Output,
   computed,
+  effect,
+  inject,
+  signal,
 } from '@angular/core';
 import { CommonModule } from '@angular/common';
 import { RouterModule } from '@angular/router';
@@ -14,12 +18,18 @@ import { MatProgressBarModule } from '@angular/material/progress-bar';
 import { MatTooltipModule } from '@angular/material/tooltip';
 import { AgentStatus } from '../../../models/agent.model';
 import { LongPressDirective } from '../../../directives/long-press.directive';
+import {
+  STATUS_COLORS,
+  STATUS_LABELS,
+  CHANNEL_ICONS,
+} from '../../../design/tokens';
 
 // ============================================================================
 // AgentCard Component
 // Per spec Section 7.3: Composes Agent Status Badge, Task Progress Bar,
 // and Quick‑Jump Button into a card with left‑border status accent.
 // CUB-26: Emits cardClick and cardLongPress for drawer/modal integration.
+// Enhanced with data-status attribute, elapsed time, and design tokens.
 // ============================================================================
 
 @Component({
@@ -38,7 +48,7 @@ import { LongPressDirective } from '../../../directives/long-press.directive';
   styleUrl: './agent-card.component.scss',
   changeDetection: ChangeDetectionStrategy.OnPush,
 })
-export class AgentCardComponent {
+export class AgentCardComponent implements OnDestroy {
   // --- Six required inputs per spec ---
 
   /** Agent status — drives badge color and left‑border accent */
@@ -73,6 +83,9 @@ export class AgentCardComponent {
   /** Error message (shown only when status is 'error') */
   @Input() errorMessage = '';
 
+  /** Elapsed time string, e.g. "04m 12s" */
+  @Input() taskElapsed = '';
+
   // --- CUB-26: Outputs for drawer/modal integration ---
 
   /** Emitted when the card is clicked — opens the session drawer. */
@@ -81,7 +94,15 @@ export class AgentCardComponent {
   /** Emitted when the card is long-pressed — bypasses drawer, opens session log directly. */
   @Output() readonly cardLongPress = new EventEmitter<string>();
 
-  // --- Computed values ---
+  // --- Internal state ---
+
+  /** Timer for refreshing relative-time label */
+  private _timer: ReturnType<typeof setInterval> | null = null;
+
+  /** Internal signal to trigger relative-time recomputation */
+  private readonly _tick = signal(0);
+
+  // --- Computed values using design tokens ---
 
   /** Map status → CSS custom property for the left‑border accent */
   readonly statusBorderColor = computed(() => {
@@ -95,46 +116,68 @@ export class AgentCardComponent {
     return map[this.status] ?? 'var(--status-offline)';
   });
 
-  /** Human‑readable status label */
+  /** Human‑readable status label (from design tokens) */
-  readonly statusLabel = computed(() => {
+  readonly statusLabel = computed(() => STATUS_LABELS[this.status] ?? this.status);
-    const labels: Record<AgentStatus, string> = {
-      active: 'Active',
-      idle: 'Idle',
-      thinking: 'Thinking…',
-      error: 'Error',
-      offline: 'Offline',
-    };
-    return labels[this.status] ?? this.status;
-  });
 
   /** CSS class suffix for the status badge dot */
   readonly statusDotClass = computed(() => `status-dot--${this.status}`);
 
-  /** Material icon name for the channel */
+  /** Material icon name for the channel (from design tokens) */
-  readonly channelIcon = computed(() => {
+  readonly channelIcon = computed(() => CHANNEL_ICONS[this.channel] ?? 'chat');
-    const icons: Record<string, string> = {
+
-      telegram: 'telegram',  // falls back to font icon if no SVG registered
+  /** Relative time string for lastActivity, refreshed every 30s */
-      slack: 'chat',
+  readonly lastActivityLabel = computed(() => {
-      discord: 'forum',
+    // Read tick to create dependency that forces recomputation
-      whatsapp: 'chat',
+    this._tick();
-      webchat: 'language',
+    return this._relativeTime(this.lastActivity);
-      email: 'email',
-    };
-    return icons[this.channel] ?? 'chat';
   });
 
-  /** Relative time string for lastActivity */
+  /** Quick‑jump route derived from sessionKey */
-  readonly lastActivityLabel = computed(() => {
+  readonly jumpRoute = computed(() => `/sessions/${this.sessionKey}`);
-    if (!this.lastActivity) return '';
+
+  /** Whether progress bar should show */
+  readonly showProgress = computed(() => this.progress > 0 && this.status !== 'error');
+
+  /** Whether error state is active */
+  readonly isError = computed(() => this.status === 'error');
+
+  /** Whether card is in an active-like state (active or thinking) */
+  readonly isActiveLike = computed(() => this.status === 'active' || this.status === 'thinking');
+
+  constructor() {
+    // Start the relative-time refresh timer
+    this._startTimer();
+  }
+
+  ngOnDestroy(): void {
+    this._stopTimer();
+  }
+
+  // --- Private helpers ---
+
+  private _relativeTime(date: Date | null | undefined): string {
+    if (!date) return '';
     const now = Date.now();
-    const then = this.lastActivity.getTime();
+    const then = date.getTime();
     const diffSec = Math.max(0, Math.floor((now - then) / 1000));
     if (diffSec < 60) return 'just now';
     if (diffSec < 3600) return `${Math.floor(diffSec / 60)}m ago`;
     if (diffSec < 86400) return `${Math.floor(diffSec / 3600)}h ago`;
     return `${Math.floor(diffSec / 86400)}d ago`;
-  });
+  }
 
-  /** Quick‑jump route derived from sessionKey */
+  private _startTimer(): void {
-  readonly jumpRoute = computed(() => `/sessions/${this.sessionKey}`);
+    this._stopTimer();
+    this._timer = setInterval(() => {
+      // Increment tick to force lastActivityLabel recomputation
+      this._tick.update(v => v + 1);
+    }, 30_000);
+  }
+
+  private _stopTimer(): void {
+    if (this._timer) {
+      clearInterval(this._timer);
+      this._timer = null;
+    }
+  }
 }

frontend/src/app/components/adaptive-navigation/adaptive-navigation.component.scss

@@ -1,14 +1,16 @@
 // ============================================================================
 // Adaptive Navigation — Desktop sidebar / Mobile header
-// Desktop (≥768px): 72px sidebar with full navigation items
+// Per CUB-27 spec breakpoints:
-// Mobile (<768px):  56px compact header with hamburger menu
+//   Compact  (0–599px):  Mobile header + hamburger + drawer
+//   Medium   (600–1023px): Collapsed sidebar (icon-only, 72px)
+//   Expanded (≥1024px):  Full sidebar with labels (72px collapsed, 256px expanded)
 // ============================================================================
 
 // ---------------------------------------------------------------------------
-// Desktop Sidebar (visible ≥768px)
+// Desktop Sidebar (visible ≥600px)
 // ---------------------------------------------------------------------------
 .adaptive-nav__sidebar {
-  display: flex;
+  display: none; // Hidden by default (mobile-first)
   flex-direction: column;
   width: var(--cc-nav-rail-collapsed-width, 72px);
   min-height: 100vh;
@@ -152,12 +154,12 @@
 }
 
 // ---------------------------------------------------------------------------
-// Mobile Header (visible <768px)
+// Mobile Header (visible <600px only)
 // ---------------------------------------------------------------------------
 .adaptive-nav__mobile-header {
   display: none; // Hidden on desktop, shown on mobile via media query
   align-items: center;
-  height: 56px;
+  height: var(--cc-header-height-compact, 56px);
   padding: 0 12px;
   background-color: var(--cc-surface-container-high);
   border-bottom: 1px solid var(--cc-outline);
@@ -167,6 +169,8 @@
 
 .adaptive-nav__hamburger {
   color: var(--cc-on-surface-variant) !important;
+  min-width: 48px;
+  min-height: 48px;
 
   &:hover {
     color: var(--cc-on-surface) !important;
@@ -196,6 +200,8 @@
 
 .adaptive-nav__mobile-action {
   color: var(--cc-on-surface-variant) !important;
+  min-width: 48px;
+  min-height: 48px;
 
   &:hover {
     color: var(--cc-on-surface) !important;
@@ -214,7 +220,7 @@
 
 .adaptive-nav__mobile-drawer {
   position: fixed;
-  top: 56px; // Below header
+  top: var(--cc-header-height-compact, 56px); // Below header
   left: 0;
   bottom: 0;
   width: 280px;
@@ -271,34 +277,73 @@
 }
 
 // ---------------------------------------------------------------------------
-// Media Queries — Layout Switch
+// Media Queries — Layout Switch (CUB-27 breakpoints)
 // ---------------------------------------------------------------------------
-// Desktop (≥768px): Show sidebar, hide mobile header
+
-// Mobile (<768px):  Hide sidebar, show compact header
+// Compact (0–599px): Show mobile header, hide sidebar
-// ---------------------------------------------------------------------------
+@media (max-width: 599px) {
-@media (min-width: 768px) {
+  .adaptive-nav__sidebar {
+    display: none;
+  }
+
+  .adaptive-nav__mobile-header {
+    display: flex;
+  }
+
+  // Hide mobile drawer and overlay on desktop
+  .adaptive-nav__overlay,
+  .adaptive-nav__mobile-drawer {
+    // These are conditional via @if in template, no display:none needed
+  }
+}
+
+// Medium (600–1023px): Show collapsed sidebar (icon-only), hide mobile
+@media (min-width: 600px) and (max-width: 1023px) {
   .adaptive-nav__sidebar {
     display: flex;
+    width: var(--cc-nav-rail-collapsed-width, 72px);
+  }
+
+  // Hide labels on medium (collapsed)
+  .adaptive-nav__sidebar-label,
+  .adaptive-nav__brand {
+    display: none;
+  }
+
+  .adaptive-nav__sidebar-header {
+    justify-content: center;
+  }
+
+  .adaptive-nav__sidebar-item {
+    flex-direction: column;
+    justify-content: center;
   }
 
   .adaptive-nav__mobile-header {
     display: none;
   }
 
-  // Hide mobile drawer and overlay on desktop
   .adaptive-nav__overlay,
   .adaptive-nav__mobile-drawer {
     display: none;
   }
 }
 
-@media (max-width: 767px) {
+// Expanded (≥1024px): Show sidebar with labels
+@media (min-width: 1024px) {
   .adaptive-nav__sidebar {
-    display: none;
+    display: flex;
+    width: var(--cc-nav-rail-collapsed-width, 72px);
+    transition: width 200ms cubic-bezier(0.4, 0, 0.2, 1);
   }
 
   .adaptive-nav__mobile-header {
-    display: flex;
+    display: none;
+  }
+
+  .adaptive-nav__overlay,
+  .adaptive-nav__mobile-drawer {
+    display: none;
   }
 }
 
@@ -313,4 +358,8 @@
   .adaptive-nav__mobile-drawer {
     animation: none;
   }
+
+  .adaptive-nav__sidebar {
+    transition: none;
+  }
 }

frontend/src/app/components/adaptive-navigation/adaptive-navigation.component.ts

@@ -1,4 +1,4 @@
-import { ChangeDetectionStrategy, Component, signal } from '@angular/core';
+import { ChangeDetectionStrategy, Component, signal, HostListener, OnDestroy, OnInit } from '@angular/core';
 import { RouterLink, RouterLinkActive } from '@angular/router';
 import { MatIconModule } from '@angular/material/icon';
 import { MatButtonModule } from '@angular/material/button';
@@ -8,13 +8,14 @@ import { NAV_DESTINATIONS } from '../../models/nav.model';
 
 /**
  * Adaptive Navigation Component — switches between desktop sidebar
- * and mobile header layouts using CSS media queries.
+ * and mobile header layouts using CSS media queries + JS breakpoint sync.
  *
- * Desktop (≥768px): 72px sidebar with full navigation items.
+ * Per CUB-27 spec breakpoints:
- * Mobile (<768px):  56px compact header with hamburger menu.
+ *   Compact  (0–599px):  Mobile header + hamburger + bottom nav
+ *   Medium   (600–1023px): Collapsed sidebar (icon-only)
+ *   Expanded (≥1024px):  Expandable sidebar (hover/click)
  *
- * The LIVE status indicator is visible in both layouts.
+ * The LIVE status indicator is visible in all layouts.
- * Per spec Section 3.1 (kiosk) and 3.2 (mobile).
  */
 @Component({
   selector: 'app-adaptive-navigation',
@@ -31,7 +32,7 @@ import { NAV_DESTINATIONS } from '../../models/nav.model';
   styleUrl: './adaptive-navigation.component.scss',
   changeDetection: ChangeDetectionStrategy.OnPush,
 })
-export class AdaptiveNavigationComponent {
+export class AdaptiveNavigationComponent implements OnInit, OnDestroy {
   /** Navigation destinations shared with other nav components */
   protected readonly destinations = NAV_DESTINATIONS;
 
@@ -41,6 +42,22 @@ export class AdaptiveNavigationComponent {
   /** Live connection status */
   protected readonly isConnected = signal(true);
 
+  /** Responsive breakpoint state */
+  protected readonly isMedium = signal(false);
+  protected readonly isExpanded = signal(false);
+
+  private readonly COMPACT_MAX = 599;
+  private readonly MEDIUM_MAX = 1023;
+
+  ngOnInit(): void {
+    this.updateBreakpoint();
+  }
+
+  @HostListener('window:resize')
+  onResize(): void {
+    this.updateBreakpoint();
+  }
+
   /** Toggle mobile menu */
   toggleMobileMenu(): void {
     this.mobileMenuOpen.update((v) => !v);
@@ -50,4 +67,18 @@ export class AdaptiveNavigationComponent {
   closeMobileMenu(): void {
     this.mobileMenuOpen.set(false);
   }
+
+  private updateBreakpoint(): void {
+    const w = window.innerWidth;
+    this.isMedium.set(w >= this.COMPACT_MAX + 1 && w <= this.MEDIUM_MAX);
+    this.isExpanded.set(w > this.MEDIUM_MAX);
+    // Close mobile menu when switching to desktop
+    if (w > this.COMPACT_MAX) {
+      this.mobileMenuOpen.set(false);
+    }
+  }
+
+  ngOnDestroy(): void {
+    // HostListener auto-unsubscribes
+  }
 }

frontend/src/app/design/tokens.ts

@@ -94,6 +94,92 @@ export const CcStatusColors = {
   offline:  { fg: '#64748b', bg: 'rgba(100, 116, 139, 0.12)', border: 'rgba(100, 116, 139, 0.40)' },
 } as const;
 
+// ---------------------------------------------------------------------------
+// Convenience exports for component usage (CUB-20)
+// ---------------------------------------------------------------------------
+/** Status colors — maps AgentStatus to hex values */
+export const STATUS_COLORS: Record<string, string> = {
+  active: '#38BDF8',
+  idle: '#2DD4BF',
+  thinking: '#A78BFA',
+  error: '#F87171',
+  offline: '#64748B',
+};
+
+/** Status background tints (12% opacity) */
+export const STATUS_BG_COLORS: Record<string, string> = {
+  active: 'rgba(56, 189, 248, 0.12)',
+  idle: 'rgba(45, 212, 191, 0.12)',
+  thinking: 'rgba(167, 139, 250, 0.12)',
+  error: 'rgba(248, 113, 113, 0.12)',
+  offline: 'rgba(100, 116, 139, 0.12)',
+};
+
+/** Surface overrides (CUB-20 convenience) */
+export const SURFACE = {
+  background: '#0D0F12',
+  surface: '#13161A',
+  container: '#1C2027',
+  containerHigh: '#252B33',
+  onSurface: '#E2E8F0',
+  onSurfaceVariant: '#8A9BB0',
+  outline: '#2D3748',
+} as const;
+
+/** Tactical Dark Mode color palette (CUB-20 convenience) */
+export const COLORS = {
+  surface: '#0F172A',
+  surfaceLight: '#1E293B',
+  primary: '#38BDF8',
+  secondary: '#2DD4BF',
+  accent: '#A78BFA',
+  danger: '#F87171',
+  textPrimary: '#FFFFFF',
+  textSecondary: '#94A3B8',
+  border: '#334155',
+} as const;
+
+/** Layout constants (CUB-20 convenience) */
+export const LAYOUT = {
+  navRailCollapsedWidth: 72,
+  navRailExpandedWidth: 256,
+  headerHeight: 64,
+  bottomNavHeight: 80,
+  cardBorderRadius: 16,
+  cardMinWidth: 320,
+  cardGap: 16,
+  cardPadding: 20,
+  sectionPadding: 24,
+  spacingUnit: 8,
+} as const;
+
+/** Breakpoints (px) (CUB-20 convenience) */
+export const BREAKPOINTS = {
+  mobile: 599,
+  tablet: 1023,
+  desktop: 1024,
+} as const;
+
+/** Channel icon mapping (CUB-20) */
+export const CHANNEL_ICONS: Record<string, string> = {
+  telegram: 'telegram',
+  slack: 'chat',
+  discord: 'forum',
+  whatsapp: 'chat',
+  webchat: 'language',
+  email: 'email',
+  mqtt: 'sensors',
+};
+
+/** Human-readable status labels (CUB-20) */
+export const STATUS_LABELS: Record<string, string> = {
+  active: 'Active',
+  idle: 'Idle',
+  thinking: 'Thinking…',
+  error: 'Error',
+  offline: 'Offline',
+};
+
 // ---------------------------------------------------------------------------
 // Typography
 // ---------------------------------------------------------------------------
@@ -263,9 +349,6 @@ export const CcTokens = {
 // ---------------------------------------------------------------------------
 // CSS Custom Property Names
 // ---------------------------------------------------------------------------
-// Use these constants when setting styles programmatically via Renderer2
-// or ElementRef.style, e.g.: el.style.setProperty(CcCssProps.colorPrimary, '#fff')
-// ---------------------------------------------------------------------------
 export const CcCssProps = {
   // Color
   colorPrimary:      '--cc-color-primary',

frontend/src/app/layout/bottom-nav/bottom-nav.component.scss

@@ -1,7 +1,8 @@
 // ============================================================================
 // Bottom Navigation Bar — Mobile Navigation
-// Per spec Section 3.2: M3 NavigationBar pattern
+// Per CUB-27 spec breakpoints:
-// Visible only on compact breakpoint (< 600px)
+//   Compact (0–599px): Visible — M3 NavigationBar pattern
+//   Medium+ (≥600px): Hidden — nav rail takes over
 // ============================================================================
 
 .bottom-nav {
@@ -17,6 +18,8 @@
   align-items: center;
   justify-content: space-around;
   padding: 0 8px;
+  // Safe area inset for notched devices
+  padding-bottom: env(safe-area-inset-bottom, 0px);
 }
 
 .bottom-nav__item {
@@ -68,9 +71,24 @@
   white-space: nowrap;
 }
 
-// Show bottom nav only on compact breakpoint
+// ---------------------------------------------------------------------------
+// Compact (0–599px): Show bottom nav
+// ---------------------------------------------------------------------------
 @media (max-width: 599px) {
   .bottom-nav {
     display: flex;
   }
+}
+
+// ---------------------------------------------------------------------------
+// Medium+ (≥600px): Hidden — nav rail takes over
+// ---------------------------------------------------------------------------
+
+// ---------------------------------------------------------------------------
+// Accessibility: Reduced Motion
+// ---------------------------------------------------------------------------
+@media (prefers-reduced-motion: reduce) {
+  .bottom-nav__item {
+    transition: none;
+  }
 }

frontend/src/app/layout/header-bar/header-bar.component.scss

@@ -1,36 +1,43 @@
 // ============================================================================
 // Header Bar — Top App Bar
-// Per spec Section 3.1: 64px tall, M3 MediumTopAppBar on expanded
+// Per CUB-27 spec breakpoints:
-// Section 3.2: SmallTopAppBar on mobile
+//   Compact  (0–599px):  SmallTopAppBar — 56px height, compact title, hidden labels
+//   Medium   (600–1023px): Medium top bar — 64px height
+//   Expanded (≥1024px):  MediumTopAppBar — 64px height, full actions
 // ============================================================================
 
 .header-bar {
   display: flex;
   align-items: center;
   justify-content: space-between;
-  height: var(--cc-header-height);
+  height: var(--cc-header-height-compact); // Compact by default (mobile-first)
-  padding: 0 var(--cc-section-padding);
+  padding: 0 var(--cc-section-padding-compact);
   background-color: var(--cc-surface-container-high);
   border-bottom: 1px solid var(--cc-outline);
   z-index: 20;
 }
 
 .header-bar__title {
-  font-size: 28px;
+  font-size: 20px;
-  font-weight: 400;
+  font-weight: 500;
   color: var(--cc-on-surface);
   margin: 0;
   letter-spacing: -0.01em;
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
 }
 
 .header-bar__actions {
   display: flex;
   align-items: center;
-  gap: 8px;
+  gap: 4px;
 }
 
 .header-bar__action-btn {
   color: var(--cc-on-surface-variant) !important;
+  min-width: 48px;
+  min-height: 48px;
 
   &:hover {
     color: var(--cc-on-surface) !important;
@@ -59,18 +66,61 @@
   vertical-align: middle;
 }
 
-// Mobile: smaller title
+// ---------------------------------------------------------------------------
+// Compact (0–599px): SmallTopAppBar — hide live label, tighter spacing
+// ---------------------------------------------------------------------------
 @media (max-width: 599px) {
+  .header-bar__live-label {
+    display: none; // Space saving on compact — dot alone is enough
+  }
+
+  .header-bar__actions {
+    gap: 0;
+  }
+}
+
+// ---------------------------------------------------------------------------
+// Medium (600–1023px): Medium top bar
+// ---------------------------------------------------------------------------
+@media (min-width: 600px) and (max-width: 1023px) {
   .header-bar {
-    padding: 0 16px;
+    height: var(--cc-header-height);
+    padding: 0 var(--cc-section-padding);
   }
 
   .header-bar__title {
-    font-size: 22px;
+    font-size: 24px;
-    font-weight: 500;
   }
 
-  .header-bar__live-label {
+  .header-bar__actions {
-    display: none; // Space saving on mobile — dot alone is enough
+    gap: 4px;
+  }
+}
+
+// ---------------------------------------------------------------------------
+// Expanded (≥1024px): Full top bar
+// ---------------------------------------------------------------------------
+@media (min-width: 1024px) {
+  .header-bar {
+    height: var(--cc-header-height);
+    padding: 0 var(--cc-section-padding);
+  }
+
+  .header-bar__title {
+    font-size: 28px;
+    font-weight: 400;
+  }
+
+  .header-bar__actions {
+    gap: 8px;
+  }
+}
+
+// ---------------------------------------------------------------------------
+// Accessibility: Reduced Motion
+// ---------------------------------------------------------------------------
+@media (prefers-reduced-motion: reduce) {
+  .header-bar__live-dot--connected {
+    animation: none;
   }
 }

frontend/src/app/layout/layout-shell/layout-shell.component.scss

@@ -1,7 +1,9 @@
 // ============================================================================
 // Layout Shell — Adaptive layout container
-// Desktop: Nav Rail (left) + Main Content (right)
+// Per CUB-27 spec breakpoints:
-// Mobile: Header + Content + Bottom Nav (stacked)
+//   Compact  (0–599px):  Header + Content + Bottom Nav (stacked)
+//   Medium   (600–1023px): Collapsed Nav Rail + Header + Content
+//   Expanded (≥1024px):  Expandable Nav Rail + Header + Content
 // ============================================================================
 
 .layout-shell {
@@ -37,21 +39,35 @@
   flex-shrink: 0;
 }
 
-// Mobile: Stack layout vertically, add bottom padding for bottom nav
+// ---------------------------------------------------------------------------
+// Compact (0–599px): Stack layout vertically, bottom nav visible
+// ---------------------------------------------------------------------------
 @media (max-width: 599px) {
   .layout-shell {
     flex-direction: column;
   }
 
   .layout-shell__content {
+    padding: var(--cc-section-padding-compact);
     // Account for bottom nav bar height
     padding-bottom: calc(var(--cc-bottom-nav-height) + 16px);
   }
 }
 
-// Tablet: Ensure content padding accommodates collapsed nav rail
+// ---------------------------------------------------------------------------
+// Medium (600–1023px): Sidebar + content, collapsed nav rail
+// ---------------------------------------------------------------------------
 @media (min-width: 600px) and (max-width: 1023px) {
   .layout-shell__content {
     padding: 20px;
   }
+}
+
+// ---------------------------------------------------------------------------
+// Expanded (≥1024px): Full nav rail with expandable behavior
+// ---------------------------------------------------------------------------
+@media (min-width: 1024px) {
+  .layout-shell__content {
+    padding: var(--cc-section-padding);
+  }
 }

frontend/src/app/layout/nav-rail/nav-rail.component.scss

@@ -1,11 +1,14 @@
 // ============================================================================
 // Nav Rail — Desktop/Kiosk Navigation
-// Per spec Section 3.1: 72px collapsed / 256px expanded
+// Per CUB-27 spec breakpoints:
+//   Compact  (0–599px):  Hidden — bottom nav takes over
+//   Medium   (600–1023px): Collapsed (72px), icon-only
+//   Expanded (≥1024px):  Expandable (72px collapsed / 256px expanded on hover)
 // Section 5.4: Spacing & Grid
 // ============================================================================
 
 .nav-rail {
-  display: flex;
+  display: none; // Hidden by default (mobile-first)
   flex-direction: column;
   width: var(--cc-nav-rail-collapsed-width);
   min-height: 100vh;
@@ -104,9 +107,52 @@
   text-overflow: ellipsis;
 }
 
-// Responsive: Hide nav rail on mobile (bottom nav takes over)
+// ---------------------------------------------------------------------------
-@media (max-width: 599px) {
+// Medium (600–1023px): Show collapsed nav rail (icon-only)
+// ---------------------------------------------------------------------------
+@media (min-width: 600px) and (max-width: 1023px) {
   .nav-rail {
+    display: flex;
+    width: var(--cc-nav-rail-collapsed-width);
+  }
+
+  // Always collapsed on medium — hide labels
+  .nav-rail__brand,
+  .nav-rail__label {
     display: none;
   }
+
+  .nav-rail__header {
+    justify-content: center;
+    padding: 16px 0;
+  }
+
+  .nav-rail__item {
+    justify-content: center;
+    padding: 0;
+    margin: 2px 8px;
+  }
+
+  // Disable expand on medium
+  .nav-rail--expanded {
+    width: var(--cc-nav-rail-collapsed-width);
+  }
+}
+
+// ---------------------------------------------------------------------------
+// Expanded (≥1024px): Full expandable nav rail
+// ---------------------------------------------------------------------------
+@media (min-width: 1024px) {
+  .nav-rail {
+    display: flex;
+  }
+}
+
+// ---------------------------------------------------------------------------
+// Accessibility: Reduced Motion
+// ---------------------------------------------------------------------------
+@media (prefers-reduced-motion: reduce) {
+  .nav-rail {
+    transition: none;
+  }
 }

frontend/src/app/layout/nav-rail/nav-rail.component.ts

@@ -1,4 +1,4 @@
-import { ChangeDetectionStrategy, Component, signal, HostListener } from '@angular/core';
+import { ChangeDetectionStrategy, Component, HostListener, signal, OnDestroy, OnInit } from '@angular/core';
 import { RouterLink, RouterLinkActive } from '@angular/router';
 import { MatIconModule } from '@angular/material/icon';
 import { MatBadgeModule } from '@angular/material/badge';
@@ -12,21 +12,52 @@ import { NAV_DESTINATIONS } from '../../models/nav.model';
   styleUrl: './nav-rail.component.scss',
   changeDetection: ChangeDetectionStrategy.OnPush,
 })
-export class NavRailComponent {
+export class NavRailComponent implements OnInit, OnDestroy {
   protected readonly destinations = NAV_DESTINATIONS;
   protected readonly expanded = signal(false);
+  protected readonly isExpandedBreakpoint = signal(false);
+
+  private readonly EXPANDED_BP = 1024;
+
+  ngOnInit(): void {
+    this.updateBreakpoint();
+  }
+
+  @HostListener('window:resize')
+  onResize(): void {
+    this.updateBreakpoint();
+  }
 
   @HostListener('mouseenter')
   onHoverIn(): void {
-    this.expanded.set(true);
+    if (this.isExpandedBreakpoint()) {
+      this.expanded.set(true);
+    }
   }
 
   @HostListener('mouseleave')
   onHoverOut(): void {
-    this.expanded.set(false);
+    if (this.isExpandedBreakpoint()) {
+      this.expanded.set(false);
+    }
   }
 
   toggleExpand(): void {
-    this.expanded.update(v => !v);
+    if (this.isExpandedBreakpoint()) {
+      this.expanded.update(v => !v);
+    }
+  }
+
+  private updateBreakpoint(): void {
+    const isExpanded = window.innerWidth >= this.EXPANDED_BP;
+    this.isExpandedBreakpoint.set(isExpanded);
+    // Collapse when leaving expanded breakpoint
+    if (!isExpanded) {
+      this.expanded.set(false);
+    }
+  }
+
+  ngOnDestroy(): void {
+    // Cleanup is handled by HostListener auto-unsubscribe
   }
 }

frontend/src/app/pages/hub/hub-page.component.html

@@ -0,0 +1,57 @@
+<!-- ========================================================================== -->
+<!-- Hub Page — Responsive Agent Card Grid with Filter Chips                   -->
+<!-- Per CUB-27 spec breakpoints:                                               -->
+<!--   Compact  (0–599px):  Single-column cards, horizontal-scroll filter chips -->
+<!--   Medium   (600–1023px): 2-column grid                                    -->
+<!--   Expanded (≥1024px): 3+ column auto-fill grid                           -->
+<!-- CUB-26: Integrates AgentCard click/long-press with session drawer.         -->
+<!-- ========================================================================== -->
+
+<div class="hub-page">
+  <h1 class="hub-page__title">Command Hub</h1>
+
+  <!-- Filter Chip Group — horizontal scroll on mobile -->
+  <div class="hub-page__filters" role="tablist" aria-label="Filter agents by status">
+    @for (filter of filters; track filter.value) {
+      <button
+        class="hub-page__filter-chip"
+        [class.hub-page__filter-chip--active]="activeFilter() === filter.value"
+        role="tab"
+        [attr.aria-selected]="activeFilter() === filter.value"
+        (click)="selectFilter(filter.value)"
+      >
+        {{ filter.label }}
+      </button>
+    }
+  </div>
+
+  <!-- Agent Card Grid -->
+  <div class="hub-page__grid">
+    @for (agent of filteredAgents(); track agent.id) {
+      <app-agent-card
+        [status]="agent.status"
+        [task]="agent.currentTask ?? ''"
+        [progress]="agent.taskProgress ?? 0"
+        [sessionKey]="agent.sessionKey"
+        [channel]="agent.channel"
+        [lastActivity]="agent.lastActivity"
+        [agentId]="agent.id"
+        [displayName]="agent.displayName"
+        [role]="agent.role"
+        [errorMessage]="agent.errorMessage ?? ''"
+        (cardClick)="onCardClick($event)"
+        (cardLongPress)="onCardLongPress($event)"
+      />
+    } @empty {
+      <p class="hub-page__empty">No agents online</p>
+    }
+  </div>
+</div>
+
+<!-- Agent Session Drawer (CUB-26) -->
+<app-agent-session-drawer
+  [isMobile]="isMobile()"
+  (openSession)="onOpenSession($event)"
+  (pinToDashboard)="onPinToDashboard($event)"
+  (drawerClose)="onDrawerClose()"
+/>

frontend/src/app/pages/hub/hub-page.component.scss

@@ -1,16 +1,18 @@
 // ============================================================================
-// Hub Page — Responsive AgentCard Grid
+// Hub Page — Responsive AgentCard Grid with Filter Chips
-// Desktop (≥1024px): 2×2 grid
+// Per CUB-27 spec breakpoints:
-// Mobile (<1024px): single-column stack
+//   Compact  (0–599px):  Single-column cards, horizontal-scroll filter chips
+//   Medium   (600–1023px): 2-column grid
+//   Expanded (≥1024px): 3+ column auto-fill grid
 // ============================================================================
 
 .hub-page {
-  display: grid;
+  display: flex;
-  grid-template-columns: 1fr;
+  flex-direction: column;
   gap: 16px;
-  padding: var(--cc-section-padding, 16px);
   min-height: 400px;
   overflow-x: hidden;
+  padding: var(--cc-section-padding);
 }
 
 .hub-page__title {
@@ -21,17 +23,119 @@
   margin: 0 0 8px;
 }
 
+// ---------------------------------------------------------------------------
+// Filter Chip Group
+// ---------------------------------------------------------------------------
+.hub-page__filters {
+  display: flex;
+  gap: 8px;
+  padding: 4px 0;
+  overflow-x: auto;
+  -webkit-overflow-scrolling: touch;
+  scrollbar-width: none; // Firefox
+
+  &::-webkit-scrollbar {
+    display: none; // Chrome/Safari
+  }
+}
+
+.hub-page__filter-chip {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  min-height: 36px;
+  min-width: 48px; // Touch target
+  padding: 6px 16px;
+  border: 1px solid var(--cc-outline);
+  border-radius: 20px;
+  background-color: transparent;
+  color: var(--cc-on-surface-variant);
+  font-size: 13px;
+  font-weight: 500;
+  letter-spacing: 0.02em;
+  cursor: pointer;
+  white-space: nowrap;
+  transition: background-color 150ms ease, color 150ms ease, border-color 150ms ease;
+  flex-shrink: 0; // Prevent shrinking in scroll container
+
+  &:hover {
+    background-color: rgba(255, 255, 255, 0.06);
+    color: var(--cc-on-surface);
+  }
+
+  &:focus-visible {
+    outline: 2px solid var(--status-active);
+    outline-offset: 2px;
+  }
+
+  &--active {
+    background-color: var(--status-active-bg);
+    color: var(--status-active);
+    border-color: var(--status-active);
+  }
+}
+
+// ---------------------------------------------------------------------------
+// Agent Card Grid
+// ---------------------------------------------------------------------------
+.hub-page__grid {
+  display: grid;
+  grid-template-columns: 1fr;
+  gap: var(--cc-card-gap);
+}
+
+// ---------------------------------------------------------------------------
+// Empty State
+// ---------------------------------------------------------------------------
 .hub-page__placeholder,
 .hub-page__empty {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  padding: 48px 24px;
   color: var(--cc-on-surface-variant);
   font-size: 16px;
   text-align: center;
-  padding: 24px 0;
 }
 
-// Desktop / kiosk breakpoint — 2-column grid
+// ---------------------------------------------------------------------------
-@media (min-width: 1024px) {
+// Compact (0–599px): Single-column cards
+// ---------------------------------------------------------------------------
+@media (max-width: 599px) {
   .hub-page {
+    padding: 0;
+  }
+
+  .hub-page__grid {
+    grid-template-columns: 1fr;
+    gap: 12px;
+  }
+
+  .hub-page__filters {
+    padding: 4px 0 8px;
+    // Ensure horizontal scroll on mobile
+    margin: 0 -8px;
+    padding-left: 8px;
+    padding-right: 8px;
+  }
+}
+
+// ---------------------------------------------------------------------------
+// Medium (600–1023px): 2-column grid
+// ---------------------------------------------------------------------------
+@media (min-width: 600px) and (max-width: 1023px) {
+  .hub-page__grid {
     grid-template-columns: repeat(2, 1fr);
+    gap: var(--cc-card-gap);
+  }
+}
+
+// ---------------------------------------------------------------------------
+// Expanded (≥1024px): 3+ column auto-fill grid
+// ---------------------------------------------------------------------------
+@media (min-width: 1024px) {
+  .hub-page__grid {
+    grid-template-columns: repeat(auto-fill, minmax(var(--cc-card-min-width), 1fr));
+    gap: var(--cc-card-gap);
   }
 }

frontend/src/app/pages/hub/hub-page.component.ts

@@ -1,51 +1,22 @@
-import { ChangeDetectionStrategy, Component, signal, ViewChild } from '@angular/core';
+import { ChangeDetectionStrategy, Component, signal, computed, ViewChild } from '@angular/core';
 import { CommonModule } from '@angular/common';
+import { MatChipsModule } from '@angular/material/chips';
 import { AgentCardComponent } from '../../command-hub/components/agent-card/agent-card.component';
 import { AgentSessionDrawerComponent } from '../../components/agent-session-drawer/index';
 import { AgentCardData } from '../../models/agent.model';
+import { AgentStatus } from '../../models/agent.model';
 
-// ============================================================================
+/**
-// Hub Page — Fleet status grid
+ * Filter options for the hub page agent card grid.
-// CUB-26: Integrates AgentCard click/long-press with session drawer.
+ * Per CUB-27: "Filter chip group (All, Active, Error, etc.) with horizontal scroll on mobile"
-// ============================================================================
+ */
+export type AgentFilter = 'all' | AgentStatus;
 
 @Component({
   selector: 'app-hub-page',
   standalone: true,
-  imports: [CommonModule, AgentCardComponent, AgentSessionDrawerComponent],
+  imports: [CommonModule, MatChipsModule, AgentCardComponent, AgentSessionDrawerComponent],
-  template: `
+  templateUrl: './hub-page.component.html',
-    <div class="hub-page">
-      <h1 class="hub-page__title">Command Hub</h1>
-      <div class="hub-page__grid">
-        @for (agent of agents(); track agent.id) {
-          <app-agent-card
-            [status]="agent.status"
-            [task]="agent.currentTask ?? ''"
-            [progress]="agent.taskProgress ?? 0"
-            [sessionKey]="agent.sessionKey"
-            [channel]="agent.channel"
-            [lastActivity]="agent.lastActivity"
-            [agentId]="agent.id"
-            [displayName]="agent.displayName"
-            [role]="agent.role"
-            [errorMessage]="agent.errorMessage ?? ''"
-            (cardClick)="onCardClick($event)"
-            (cardLongPress)="onCardLongPress($event)"
-          />
-        } @empty {
-          <p class="hub-page__empty">No agents online</p>
-        }
-      </div>
-    </div>
-
-    <!-- Agent Session Drawer -->
-    <app-agent-session-drawer
-      [isMobile]="isMobile()"
-      (openSession)="onOpenSession($event)"
-      (pinToDashboard)="onPinToDashboard($event)"
-      (drawerClose)="onDrawerClose()"
-    />
-  `,
   styleUrl: './hub-page.component.scss',
   changeDetection: ChangeDetectionStrategy.OnPush,
 })
@@ -54,6 +25,17 @@ export class HubPageComponent {
 
   readonly isMobile = signal(false);
 
+  protected readonly filters: { label: string; value: AgentFilter }[] = [
+    { label: 'All', value: 'all' },
+    { label: 'Active', value: 'active' },
+    { label: 'Idle', value: 'idle' },
+    { label: 'Thinking', value: 'thinking' },
+    { label: 'Error', value: 'error' },
+    { label: 'Offline', value: 'offline' },
+  ];
+
+  protected readonly activeFilter = signal<AgentFilter>('all');
+
   /** Stub agent data (TODO: wire to AgentStatusService / SignalR). */
   readonly agents = signal<AgentCardData[]>([
     {
@@ -73,10 +55,10 @@ export class HubPageComponent {
       displayName: 'Rex',
       role: 'Frontend Agent',
       status: 'thinking',
-      currentTask: 'Building agent session drawer',
+      currentTask: 'Building responsive layout',
       taskProgress: 40,
       taskElapsed: '02m 30s',
-      sessionKey: 'agent:rex:telegram:CUB-26:def456',
+      sessionKey: 'agent:rex:telegram:CUB-27:def456',
       channel: 'telegram',
       lastActivity: new Date(Date.now() - 30000),
     },
@@ -119,6 +101,12 @@ export class HubPageComponent {
     },
   ]);
 
+  protected readonly filteredAgents = computed(() => {
+    const filter = this.activeFilter();
+    if (filter === 'all') return this.agents();
+    return this.agents().filter(a => a.status === filter);
+  });
+
   constructor() {
     // Detect mobile viewport
     if (typeof window !== 'undefined') {
@@ -128,6 +116,10 @@ export class HubPageComponent {
     }
   }
 
+  protected selectFilter(filter: AgentFilter): void {
+    this.activeFilter.set(filter);
+  }
+
   /** Card click → open session drawer with agent details. */
   onCardClick(sessionKey: string): void {
     const agent = this.agents().find((a) => a.sessionKey === sessionKey);

frontend/src/styles.scss

@@ -54,6 +54,67 @@ html {
 // ---------------------------------------------------------------------------
 @include css-props.emit-custom-properties;
 
+// ---------------------------------------------------------------------------
+// Per spec Section 5.1 "Status Colors (Semantic — outside M3 tonal system)"
+// These are NOT part of the M3 tonal palette; they are semantic overrides.
+// ---------------------------------------------------------------------------
+:root {
+  // --- Tactical Dark Mode color palette (CUB-47) ---
+  --color-surface: #0F172A;
+  --color-surface-light: #1E293B;
+  --color-primary: #38BDF8;
+  --color-secondary: #2DD4BF;
+  --color-accent: #A78BFA;
+  --color-danger: #F87171;
+  --color-text-primary: #FFFFFF;
+  --color-text-secondary: #94A3B8;
+  --color-border: #334155;
+
+  // --- Status colors ---
+  --status-active: #38BDF8;
+  --status-idle: #2DD4BF;
+  --status-thinking: #A78BFA;
+  --status-error: #F87171;
+  --status-offline: #64748B;
+
+  // --- Status background tints (12% opacity) ---
+  --status-active-bg: rgba(56, 189, 248, 0.12);
+  --status-idle-bg: rgba(45, 212, 191, 0.12);
+  --status-thinking-bg: rgba(167, 139, 250, 0.12);
+  --status-error-bg: rgba(248, 113, 113, 0.12);
+
+  // --- Surface overrides (tactical dark palette) ---
+  --cc-background: #0D0F12;
+  --cc-surface: #13161A;
+  --cc-surface-container: #1C2027;
+  --cc-surface-container-high: #252B33;
+  --cc-on-surface: #E2E8F0;
+  --cc-on-surface-variant: #8A9BB0;
+  --cc-outline: #2D3748;
+
+  // --- Mono font stack ---
+  --cc-font-mono: 'Roboto Mono', 'Cascadia Code', 'Fira Code', monospace;
+
+  // --- Layout constants ---
+  --cc-nav-rail-collapsed-width: 72px;
+  --cc-nav-rail-expanded-width: 256px;
+  --cc-header-height: 64px;
+  --cc-header-height-compact: 56px;
+  --cc-bottom-nav-height: 80px;
+  --cc-card-border-radius: 16px;
+  --cc-card-min-width: 280px;
+  --cc-card-gap: 16px;
+  --cc-card-padding: 20px;
+  --cc-section-padding: 24px;
+  --cc-section-padding-compact: 16px;
+  --cc-spacing-unit: 8px;
+
+  // --- Responsive breakpoints (CUB-27) ---
+  --cc-breakpoint-compact: 599px;   // 0-599px: phone / compact
+  --cc-breakpoint-medium: 600px;   // 600-1023px: tablet / medium
+  --cc-breakpoint-expanded: 1024px; // ≥1024px: desktop/kiosk / expanded
+}
+
 // ---------------------------------------------------------------------------
 // Global Body Styles
 // ---------------------------------------------------------------------------

frontend/src/styles/_tokens.scss

@@ -434,4 +434,41 @@ $min-body-font:       16px;
 @mixin touch-target($min-size: $min-touch-target) {
   min-width: $min-size;
   min-height: $min-size;
-}
+}
+// ============================================================================
+// CUB-20 / CUB-27 CONVENIENCE ALIASES
+// ============================================================================
+// Short aliases used by agent-card, hub-page, and other components.
+// These map to the canonical M3 tokens above.
+
+$cc-background:            $color-surface-darkest;
+$cc-surface:               $color-surface-dark;
+$cc-surface-container:     $color-surface-medium;
+$cc-surface-container-high: $color-surface-light;
+$cc-on-surface:            $color-on-surface;
+$cc-on-surface-variant:    $color-on-surface-variant;
+$cc-outline:               $color-surface-lighter;
+
+$cc-font-mono:             $font-family-mono;
+$cc-font-family:           $font-family-brand;
+
+$cc-nav-rail-collapsed-width:  $nav-rail-collapsed-width;
+$cc-nav-rail-expanded-width:   $nav-rail-expanded-width;
+$cc-header-height:              $header-height;
+$cc-bottom-nav-height:          $bottom-nav-height;
+$cc-card-border-radius:         $card-border-radius;
+$cc-card-min-width:             $card-min-width;
+$cc-card-gap:                   $spacing-card-gap;
+$cc-card-padding:               $spacing-card-pad;
+$cc-section-padding:            $spacing-section;
+$cc-spacing-unit:               $spacing-unit;
+
+$cc-breakpoint-mobile:   $breakpoint-compact;
+$cc-breakpoint-tablet:   $breakpoint-medium;
+$cc-breakpoint-desktop:  $breakpoint-expanded;
+
+$cc-surface-darkest: $color-surface-darkest;
+$cc-surface-dark:    $color-surface-dark;
+$cc-surface-medium:  $color-surface-medium;
+$cc-surface-light:  $color-surface-light;
+$cc-surface-lighter: $color-surface-lighter;

go-backend/cmd/server/main.go

@@ -0,0 +1,88 @@
+// Command server starts the Control Center Go backend API server.
+package main
+
+import (
+	"context"
+	"fmt"
+	"log/slog"
+	"net/http"
+	"os"
+	"os/signal"
+	"syscall"
+	"time"
+
+	"code.cubecraftcreations.com/CubeCraft-Creations/Control-Center/go-backend/internal/config"
+	"code.cubecraftcreations.com/CubeCraft-Creations/Control-Center/go-backend/internal/handler"
+	"code.cubecraftcreations.com/CubeCraft-Creations/Control-Center/go-backend/internal/router"
+	"code.cubecraftcreations.com/CubeCraft-Creations/Control-Center/go-backend/internal/store"
+)
+
+func main() {
+	// ── Configuration ──────────────────────────────────────────────────────
+	cfg := config.Load()
+
+	// ── Logging ────────────────────────────────────────────────────────────
+	logger := slog.New(slog.NewJSONHandler(os.Stdout, &slog.HandlerOptions{
+		Level: parseLogLevel(cfg.LogLevel),
+	}))
+	slog.SetDefault(logger)
+
+	// ── Stores (in-memory for now; PostgreSQL after CUB-120) ────────────────
+	agentStore := store.NewAgentStore()
+	sessionStore := store.NewSessionStore()
+	taskStore := store.NewTaskStore()
+	projectStore := store.NewProjectStore()
+
+	// ── HTTP handler ───────────────────────────────────────────────────────
+	h := handler.NewHandler(agentStore, sessionStore, taskStore, projectStore)
+
+	// ── Router ─────────────────────────────────────────────────────────────
+	r := router.New(h)
+
+	// ── Server ─────────────────────────────────────────────────────────────
+	srv := &http.Server{
+		Addr:         fmt.Sprintf(":%d", cfg.Port),
+		Handler:      r,
+		ReadTimeout:  10 * time.Second,
+		WriteTimeout: 15 * time.Second,
+		IdleTimeout:  60 * time.Second,
+	}
+
+	// Graceful shutdown
+	quit := make(chan os.Signal, 1)
+	signal.Notify(quit, syscall.SIGINT, syscall.SIGTERM)
+
+	go func() {
+		slog.Info("server starting", "port", cfg.Port, "env", cfg.Environment)
+		if err := srv.ListenAndServe(); err != nil && err != http.ErrServerClosed {
+			slog.Error("server failed", "error", err)
+			os.Exit(1)
+		}
+	}()
+
+	<-quit
+	slog.Info("shutting down server...")
+
+	ctx, cancel := context.WithTimeout(context.Background(), 15*time.Second)
+	defer cancel()
+
+	if err := srv.Shutdown(ctx); err != nil {
+		slog.Error("server forced to shutdown", "error", err)
+		os.Exit(1)
+	}
+
+	slog.Info("server exited cleanly")
+}
+
+func parseLogLevel(level string) slog.Level {
+	switch level {
+	case "debug":
+		return slog.LevelDebug
+	case "warn":
+		return slog.LevelWarn
+	case "error":
+		return slog.LevelError
+	default:
+		return slog.LevelInfo
+	}
+}

go-backend/go.mod

@@ -0,0 +1,21 @@
+module code.cubecraftcreations.com/CubeCraft-Creations/Control-Center/go-backend
+
+go 1.23
+
+require (
+	github.com/go-chi/chi/v5 v5.2.0
+	github.com/go-chi/cors v1.2.1
+	github.com/go-playground/validator/v10 v10.24.0
+	github.com/google/uuid v1.6.0
+)
+
+require (
+	github.com/gabriel-vasile/mimetype v1.4.8 // indirect
+	github.com/go-playground/locales v0.14.1 // indirect
+	github.com/go-playground/universal-translator v0.18.1 // indirect
+	github.com/leodido/go-urn v1.4.0 // indirect
+	golang.org/x/crypto v0.32.0 // indirect
+	golang.org/x/net v0.34.0 // indirect
+	golang.org/x/sys v0.29.0 // indirect
+	golang.org/x/text v0.21.0 // indirect
+)

go-backend/go.sum

@@ -0,0 +1,34 @@
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/gabriel-vasile/mimetype v1.4.8 h1:FfZ3gj38NjllZIeJAmMhr+qKL8Wu+nOoI3GqacKw1NM=
+github.com/gabriel-vasile/mimetype v1.4.8/go.mod h1:ByKUIKGjh1ODkGM1asKUbQZOLGrPjydw3hYPU2YU9t8=
+github.com/go-chi/chi/v5 v5.2.0 h1:Aj1EtB0qR2Rdo2dG4O94RIU35w2lvQSj6BRA4+qwFL0=
+github.com/go-chi/chi/v5 v5.2.0/go.mod h1:DslCQbL2OYiznFReuXYUmQ2hGd1aDpCnlMNITLSKoi8=
+github.com/go-chi/cors v1.2.1 h1:xEC8UT3Rlp2QuWNEr4Fs/c2EAGVKBwy/1vHx3bppil4=
+github.com/go-chi/cors v1.2.1/go.mod h1:sSbTewc+6wYHBBCW7ytsFSn836hqM7JxpglAy2Vzc58=
+github.com/go-playground/assert/v2 v2.2.0 h1:JvknZsQTYeFEAhQwI4qEt9cyV5ONwRHC+lYKSsYSR8s=
+github.com/go-playground/assert/v2 v2.2.0/go.mod h1:VDjEfimB/XKnb+ZQfWdccd7VUvScMdVu0Titje2rxJ4=
+github.com/go-playground/locales v0.14.1 h1:EWaQ/wswjilfKLTECiXz7Rh+3BjFhfDFKv/oXslEjJA=
+github.com/go-playground/locales v0.14.1/go.mod h1:hxrqLVvrK65+Rwrd5Fc6F2O76J/NuW9t0sjnWqG1slY=
+github.com/go-playground/universal-translator v0.18.1 h1:Bcnm0ZwsGyWbCzImXv+pAJnYK9S473LQFuzCbDbfSFY=
+github.com/go-playground/universal-translator v0.18.1/go.mod h1:xekY+UJKNuX9WP91TpwSH2VMlDf28Uj24BCp08ZFTUY=
+github.com/go-playground/validator/v10 v10.24.0 h1:KHQckvo8G6hlWnrPX4NJJ+aBfWNAE/HH+qdL2cBpCmg=
+github.com/go-playground/validator/v10 v10.24.0/go.mod h1:GGzBIJMuE98Ic/kJsBXbz1x/7cByt++cQ+YOuDM5wus=
+github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
+github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
+github.com/leodido/go-urn v1.4.0 h1:WT9HwE9SGECu3lg4d/dIA+jxlljEa1/ffXKmRjqdmIQ=
+github.com/leodido/go-urn v1.4.0/go.mod h1:bvxc+MVxLKB4z00jd1z+Dvzr47oO32F/QSNjSBOlFxI=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/testify v1.8.4 h1:CcVxjf3Q8PM0mHUKJCdn+eZZtm5yQwehR5yeSVQQcUk=
+github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
+golang.org/x/crypto v0.32.0 h1:euUpcYgM8WcP71gNpTqQCn6rC2t6ULUPiOzfWaXVVfc=
+golang.org/x/crypto v0.32.0/go.mod h1:ZnnJkOaASj8g0AjIduWNlq2NRxL0PlBrbKVyZ6V/Ugc=
+golang.org/x/net v0.34.0 h1:Mb7Mrk043xzHgnRM88suvJFwzVrRfHEHJEl5/71CKw0=
+golang.org/x/net v0.34.0/go.mod h1:di0qlW3YNM5oh6GqDGQr92MyTozJPmybPK4Ev/Gm31k=
+golang.org/x/sys v0.29.0 h1:TPYlXGxvx1MGTn2GiZDhnjPA9wZzZeGKHHmKhHYvgaU=
+golang.org/x/sys v0.29.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/text v0.21.0 h1:zyQAAkrwaneQ066sspRyJaG9VNi/YJ1NfzcGB3hZ/qo=
+golang.org/x/text v0.21.0/go.mod h1:4IBbMaMmOPCJ8SecivzSH54+73PCFmPWxNTLm+vZkEQ=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

go-backend/internal/config/config.go

@@ -0,0 +1,45 @@
+// Package config provides application configuration loaded from environment
+// variables with sensible defaults for local development.
+package config
+
+import (
+	"os"
+	"strconv"
+)
+
+// Config holds all application configuration.
+type Config struct {
+	Port         int
+	DatabaseURL  string
+	CORSOrigin   string
+	LogLevel     string
+	Environment  string
+}
+
+// Load reads configuration from environment variables, applying defaults where
+// values are not set. All secrets come from the environment — nothing is hardcoded.
+func Load() *Config {
+	return &Config{
+		Port:        getEnvInt("PORT", 8080),
+		DatabaseURL: getEnv("DATABASE_URL", "postgres://controlcenter:controlcenter@localhost:5432/controlcenter?sslmode=disable"),
+		CORSOrigin:  getEnv("CORS_ORIGIN", "*"),
+		LogLevel:    getEnv("LOG_LEVEL", "info"),
+		Environment: getEnv("ENVIRONMENT", "development"),
+	}
+}
+
+func getEnv(key, fallback string) string {
+	if v := os.Getenv(key); v != "" {
+		return v
+	}
+	return fallback
+}
+
+func getEnvInt(key string, fallback int) int {
+	if v := os.Getenv(key); v != "" {
+		if i, err := strconv.Atoi(v); err == nil {
+			return i
+		}
+	}
+	return fallback
+}

go-backend/internal/handler/agent.go

@@ -0,0 +1,158 @@
+// Package handler contains HTTP handlers for the Control Center API.
+// Each handler is a method on a Handler struct that receives its
+// dependencies (stores) through dependency injection.
+package handler
+
+import (
+	"encoding/json"
+	"net/http"
+	"time"
+
+	"code.cubecraftcreations.com/CubeCraft-Creations/Control-Center/go-backend/internal/models"
+	"code.cubecraftcreations.com/CubeCraft-Creations/Control-Center/go-backend/internal/store"
+	"github.com/go-chi/chi/v5"
+	"github.com/go-playground/validator/v10"
+)
+
+// Handler groups all route handlers and their dependencies.
+type Handler struct {
+	AgentStore   *store.AgentStore
+	SessionStore *store.SessionStore
+	TaskStore    *store.TaskStore
+	ProjectStore *store.ProjectStore
+	validate     *validator.Validate
+}
+
+// NewHandler returns a fully wired Handler.
+func NewHandler(
+	as *store.AgentStore,
+	ss *store.SessionStore,
+	ts *store.TaskStore,
+	ps *store.ProjectStore,
+) *Handler {
+	v := validator.New()
+	v.RegisterValidation("agentStatus", validateAgentStatus)
+	return &Handler{
+		AgentStore:   as,
+		SessionStore: ss,
+		TaskStore:    ts,
+		ProjectStore: ps,
+		validate:     v,
+	}
+}
+
+// ─── Agent Handlers ────────────────────────────────────────────────────────────
+
+// ListAgents handles GET /api/agents.
+func (h *Handler) ListAgents(w http.ResponseWriter, r *http.Request) {
+	statusFilter := models.AgentStatus(r.URL.Query().Get("status"))
+	allAgents := h.AgentStore.List(statusFilter)
+
+	page, pageSize := parsePagination(r)
+	start, end := paginateSlice(len(allAgents), page, pageSize)
+
+	pageSlice := allAgents[start:end]
+	writeJSON(w, http.StatusOK, models.PaginatedResponse{
+		Data:       pageSlice,
+		TotalCount: h.AgentStore.Count(),
+		Page:       page,
+		PageSize:   pageSize,
+		HasMore:    end < len(allAgents),
+	})
+}
+
+// GetAgent handles GET /api/agents/{id}.
+func (h *Handler) GetAgent(w http.ResponseWriter, r *http.Request) {
+	id := chi.URLParam(r, "id")
+	agent, ok := h.AgentStore.Get(id)
+	if !ok {
+		writeJSON(w, http.StatusNotFound, models.ErrorResponse{Error: "agent not found"})
+		return
+	}
+	writeJSON(w, http.StatusOK, agent)
+}
+
+// CreateAgent handles POST /api/agents.
+func (h *Handler) CreateAgent(w http.ResponseWriter, r *http.Request) {
+	var req models.CreateAgentRequest
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		writeJSON(w, http.StatusBadRequest, models.ErrorResponse{Error: "invalid request body"})
+		return
+	}
+
+	if err := h.validate.Struct(req); err != nil {
+		writeJSON(w, http.StatusUnprocessableEntity, models.ErrorResponse{
+			Error:   "validation failed",
+			Details: validationErrors(err),
+		})
+		return
+	}
+
+	agent := models.AgentCardData{
+		ID:          req.ID,
+		DisplayName: req.DisplayName,
+		Role:        req.Role,
+		Status:      req.Status,
+		CurrentTask: req.CurrentTask,
+		SessionKey:  req.SessionKey,
+		Channel:     req.Channel,
+		LastActivity: time.Now().UTC().Format(time.RFC3339),
+	}
+
+	if ok := h.AgentStore.Create(agent); !ok {
+		writeJSON(w, http.StatusConflict, models.ErrorResponse{Error: "agent with this ID already exists"})
+		return
+	}
+	writeJSON(w, http.StatusCreated, agent)
+}
+
+// UpdateAgent handles PUT /api/agents/{id}.
+func (h *Handler) UpdateAgent(w http.ResponseWriter, r *http.Request) {
+	id := chi.URLParam(r, "id")
+
+	var req models.UpdateAgentRequest
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		writeJSON(w, http.StatusBadRequest, models.ErrorResponse{Error: "invalid request body"})
+		return
+	}
+
+	if err := h.validate.Struct(req); err != nil {
+		writeJSON(w, http.StatusUnprocessableEntity, models.ErrorResponse{
+			Error:   "validation failed",
+			Details: validationErrors(err),
+		})
+		return
+	}
+
+	agent, ok := h.AgentStore.Update(id, req)
+	if !ok {
+		writeJSON(w, http.StatusNotFound, models.ErrorResponse{Error: "agent not found"})
+		return
+	}
+	writeJSON(w, http.StatusOK, agent)
+}
+
+// DeleteAgent handles DELETE /api/agents/{id}.
+func (h *Handler) DeleteAgent(w http.ResponseWriter, r *http.Request) {
+	id := chi.URLParam(r, "id")
+	if ok := h.AgentStore.Delete(id); !ok {
+		writeJSON(w, http.StatusNotFound, models.ErrorResponse{Error: "agent not found"})
+		return
+	}
+	w.WriteHeader(http.StatusNoContent)
+}
+
+// AgentHistory handles GET /api/agents/{id}/history.
+func (h *Handler) AgentHistory(w http.ResponseWriter, r *http.Request) {
+	id := chi.URLParam(r, "id")
+	if _, ok := h.AgentStore.Get(id); !ok {
+		writeJSON(w, http.StatusNotFound, models.ErrorResponse{Error: "agent not found"})
+		return
+	}
+
+	history := h.AgentStore.History(id)
+	if history == nil {
+		history = []models.AgentStatusHistoryEntry{}
+	}
+	writeJSON(w, http.StatusOK, history)
+}

go-backend/internal/handler/handler_test.go

@@ -0,0 +1,369 @@
+package handler
+
+import (
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+
+	"code.cubecraftcreations.com/CubeCraft-Creations/Control-Center/go-backend/internal/models"
+	"code.cubecraftcreations.com/CubeCraft-Creations/Control-Center/go-backend/internal/store"
+	"github.com/go-chi/chi/v5"
+)
+
+// testHandler creates a Handler wired to fresh in-memory stores for testing.
+func testHandler(t *testing.T) *Handler {
+	t.Helper()
+	return NewHandler(
+		store.NewAgentStore(),
+		store.NewSessionStore(),
+		store.NewTaskStore(),
+		store.NewProjectStore(),
+	)
+}
+
+// serveChi creates a chi.Mux with the standard routes registered, then
+// serves a request against it. Returns the recorded response.
+func serveChi(h *Handler, method, path, body string) *httptest.ResponseRecorder {
+	w := httptest.NewRecorder()
+	req := httptest.NewRequest(method, path, strings.NewReader(body))
+	req.Header.Set("Content-Type", "application/json")
+
+	r := chi.NewRouter()
+	r.Route("/api", func(api chi.Router) {
+		api.Route("/agents", func(agents chi.Router) {
+			agents.Get("/", h.ListAgents)
+			agents.Post("/", h.CreateAgent)
+			agents.Get("/{id}", h.GetAgent)
+			agents.Put("/{id}", h.UpdateAgent)
+			agents.Delete("/{id}", h.DeleteAgent)
+			agents.Get("/{id}/history", h.AgentHistory)
+		})
+		api.Get("/sessions", h.ListSessions)
+		api.Get("/tasks", h.ListTasks)
+		api.Get("/projects", h.ListProjects)
+	})
+	r.ServeHTTP(w, req)
+	return w
+}
+
+func parseBody(t *testing.T, w *httptest.ResponseRecorder) map[string]any {
+	t.Helper()
+	var body map[string]any
+	if err := json.NewDecoder(w.Result().Body).Decode(&body); err != nil {
+		t.Fatalf("failed to decode body: %v", err)
+	}
+	return body
+}
+
+func parseAgent(t *testing.T, w *httptest.ResponseRecorder) models.AgentCardData {
+	t.Helper()
+	var a models.AgentCardData
+	if err := json.NewDecoder(w.Result().Body).Decode(&a); err != nil {
+		t.Fatalf("failed to decode agent: %v", err)
+	}
+	return a
+}
+
+func parsePaginated(t *testing.T, w *httptest.ResponseRecorder) models.PaginatedResponse {
+	t.Helper()
+	var pr models.PaginatedResponse
+	if err := json.NewDecoder(w.Result().Body).Decode(&pr); err != nil {
+		t.Fatalf("failed to decode paginated response: %v", err)
+	}
+	return pr
+}
+
+// ─── Agent Tests ───────────────────────────────────────────────────────────────
+
+func TestCreateAgent_Success(t *testing.T) {
+	h := testHandler(t)
+	w := serveChi(h, "POST", "/api/agents", `{
+		"id": "dex",
+		"displayName": "Dex",
+		"role": "Backend Dev",
+		"status": "idle",
+		"sessionKey": "sess-1",
+		"channel": "discord"
+	}`)
+
+	if w.Code != http.StatusCreated {
+		t.Fatalf("expected 201, got %d: %s", w.Code, w.Body.String())
+	}
+
+	a := parseAgent(t, w)
+	if a.ID != "dex" {
+		t.Errorf("expected id=dax, got %s", a.ID)
+	}
+	if a.Status != models.AgentStatusIdle {
+		t.Errorf("expected status=idle, got %s", a.Status)
+	}
+}
+
+func TestCreateAgent_Duplicate(t *testing.T) {
+	h := testHandler(t)
+	serveChi(h, "POST", "/api/agents", `{"id":"otto","displayName":"Otto","role":"Orchestrator","status":"active","sessionKey":"s1","channel":"discord"}`)
+	w := serveChi(h, "POST", "/api/agents", `{"id":"otto","displayName":"Otto","role":"Orchestrator","status":"active","sessionKey":"s2","channel":"discord"}`)
+
+	if w.Code != http.StatusConflict {
+		t.Fatalf("expected 409, got %d", w.Code)
+	}
+}
+
+func TestCreateAgent_Validation(t *testing.T) {
+	h := testHandler(t)
+	// Missing displayName
+	w := serveChi(h, "POST", "/api/agents", `{"id":"dex","status":"idle","sessionKey":"s1","channel":"discord"}`)
+	if w.Code != http.StatusUnprocessableEntity {
+		t.Fatalf("expected 422, got %d", w.Code)
+	}
+}
+
+func TestCreateAgent_InvalidStatus(t *testing.T) {
+	h := testHandler(t)
+	w := serveChi(h, "POST", "/api/agents", `{"id":"dex","displayName":"Dex","role":"Dev","status":"flying","sessionKey":"s1","channel":"discord"}`)
+	if w.Code != http.StatusUnprocessableEntity {
+		t.Fatalf("expected 422 for invalid status, got %d", w.Code)
+	}
+}
+
+func TestGetAgent_NotFound(t *testing.T) {
+	h := testHandler(t)
+	w := serveChi(h, "GET", "/api/agents/nonexistent", "")
+	if w.Code != http.StatusNotFound {
+		t.Fatalf("expected 404, got %d", w.Code)
+	}
+}
+
+func TestGetAgent_Success(t *testing.T) {
+	h := testHandler(t)
+	serveChi(h, "POST", "/api/agents", `{"id":"pip","displayName":"Pip","role":"Edge Dev","status":"idle","sessionKey":"s1","channel":"discord"}`)
+	w := serveChi(h, "GET", "/api/agents/pip", "")
+
+	if w.Code != http.StatusOK {
+		t.Fatalf("expected 200, got %d", w.Code)
+	}
+	a := parseAgent(t, w)
+	if a.DisplayName != "Pip" {
+		t.Errorf("expected Pip, got %s", a.DisplayName)
+	}
+}
+
+func TestListAgents(t *testing.T) {
+	h := testHandler(t)
+	serveChi(h, "POST", "/api/agents", `{"id":"a1","displayName":"Alpha","role":"Tester","status":"idle","sessionKey":"s1","channel":"discord"}`)
+	serveChi(h, "POST", "/api/agents", `{"id":"a2","displayName":"Beta","role":"Tester","status":"active","sessionKey":"s2","channel":"discord"}`)
+
+	w := serveChi(h, "GET", "/api/agents", "")
+	if w.Code != http.StatusOK {
+		t.Fatalf("expected 200, got %d", w.Code)
+	}
+
+	pr := parsePaginated(t, w)
+	if pr.TotalCount != 2 {
+		t.Errorf("expected totalCount=2, got %d", pr.TotalCount)
+	}
+}
+
+func TestListAgents_FilterByStatus(t *testing.T) {
+	h := testHandler(t)
+	serveChi(h, "POST", "/api/agents", `{"id":"a1","displayName":"Alpha","role":"Tester","status":"idle","sessionKey":"s1","channel":"discord"}`)
+	serveChi(h, "POST", "/api/agents", `{"id":"a2","displayName":"Beta","role":"Tester","status":"active","sessionKey":"s2","channel":"discord"}`)
+
+	w := serveChi(h, "GET", "/api/agents?status=active", "")
+	pr := parsePaginated(t, w)
+	if pr.TotalCount != 2 {
+		t.Errorf("expected totalCount=2 (unfiltered), got %d", pr.TotalCount)
+	}
+}
+
+func TestUpdateAgent(t *testing.T) {
+	h := testHandler(t)
+	serveChi(h, "POST", "/api/agents", `{"id":"hex","displayName":"Hex","role":"DB Specialist","status":"idle","sessionKey":"s1","channel":"discord"}`)
+
+	w := serveChi(h, "PUT", "/api/agents/hex", `{"status":"thinking","currentTask":"schema review"}`)
+	if w.Code != http.StatusOK {
+		t.Fatalf("expected 200, got %d: %s", w.Code, w.Body.String())
+	}
+
+	a := parseAgent(t, w)
+	if a.Status != models.AgentStatusThinking {
+		t.Errorf("expected status=thinking, got %s", a.Status)
+	}
+	if a.CurrentTask == nil || *a.CurrentTask != "schema review" {
+		t.Errorf("expected currentTask=schema review")
+	}
+}
+
+func TestUpdateAgent_NotFound(t *testing.T) {
+	h := testHandler(t)
+	w := serveChi(h, "PUT", "/api/agents/nope", `{"status":"idle"}`)
+	if w.Code != http.StatusNotFound {
+		t.Fatalf("expected 404, got %d", w.Code)
+	}
+}
+
+func TestDeleteAgent(t *testing.T) {
+	h := testHandler(t)
+	serveChi(h, "POST", "/api/agents", `{"id":"temp","displayName":"Temp","role":"Temp","status":"idle","sessionKey":"s1","channel":"discord"}`)
+
+	w := serveChi(h, "DELETE", "/api/agents/temp", "")
+	if w.Code != http.StatusNoContent {
+		t.Fatalf("expected 204, got %d", w.Code)
+	}
+
+	// Verify gone
+	w2 := serveChi(h, "GET", "/api/agents/temp", "")
+	if w2.Code != http.StatusNotFound {
+		t.Fatalf("expected 404 after delete, got %d", w2.Code)
+	}
+}
+
+func TestAgentHistory(t *testing.T) {
+	h := testHandler(t)
+	serveChi(h, "POST", "/api/agents", `{"id":"nano","displayName":"Nano","role":"Firmware","status":"idle","sessionKey":"s1","channel":"discord"}`)
+	serveChi(h, "PUT", "/api/agents/nano", `{"status":"thinking","currentTask":"mqtt payload"}`)
+
+	w := serveChi(h, "GET", "/api/agents/nano/history", "")
+	if w.Code != http.StatusOK {
+		t.Fatalf("expected 200, got %d", w.Code)
+	}
+
+	var entries []models.AgentStatusHistoryEntry
+	json.NewDecoder(w.Result().Body).Decode(&entries)
+	if len(entries) < 2 {
+		t.Errorf("expected at least 2 history entries, got %d", len(entries))
+	}
+	// Newest first — first entry should be "thinking"
+	if entries[0].Status != models.AgentStatusThinking {
+		t.Errorf("expected newest entry status=thinking, got %s", entries[0].Status)
+	}
+}
+
+func TestAgentHistory_NotFound(t *testing.T) {
+	h := testHandler(t)
+	w := serveChi(h, "GET", "/api/agents/ghost/history", "")
+	if w.Code != http.StatusNotFound {
+		t.Fatalf("expected 404, got %d", w.Code)
+	}
+}
+
+// ─── Session Tests ─────────────────────────────────────────────────────────════
+
+func TestListSessions_Empty(t *testing.T) {
+	h := testHandler(t)
+	w := serveChi(h, "GET", "/api/sessions", "")
+	if w.Code != http.StatusOK {
+		t.Fatalf("expected 200, got %d", w.Code)
+	}
+	pr := parsePaginated(t, w)
+	if pr.TotalCount != 0 {
+		t.Errorf("expected 0 sessions, got %d", pr.TotalCount)
+	}
+}
+
+func TestListSessions_WithData(t *testing.T) {
+	h := testHandler(t)
+	h.SessionStore.Create(models.Session{
+		SessionKey: "sess-1",
+		AgentID:    "dex",
+		Channel:    "discord",
+		Status:     "running",
+		Model:      "deepseek-v4",
+	})
+	h.SessionStore.Create(models.Session{
+		SessionKey: "sess-2",
+		AgentID:    "otto",
+		Channel:    "discord",
+		Status:     "done",
+		Model:      "deepseek-v4",
+	})
+
+	w := serveChi(h, "GET", "/api/sessions", "")
+	pr := parsePaginated(t, w)
+	if pr.TotalCount != 2 {
+		t.Errorf("expected totalCount=2, got %d", pr.TotalCount)
+	}
+}
+
+// ─── Task Tests ────────────────────────────────────────────────────────────────
+
+func TestListTasks_Empty(t *testing.T) {
+	h := testHandler(t)
+	w := serveChi(h, "GET", "/api/tasks", "")
+	if w.Code != http.StatusOK {
+		t.Fatalf("expected 200, got %d", w.Code)
+	}
+}
+
+func TestListTasks_WithData(t *testing.T) {
+	h := testHandler(t)
+	h.TaskStore.Create(models.Task{
+		AgentID: "dex",
+		Title:   "Implement CRUD API",
+		Status:  models.TaskStatusRunning,
+	})
+
+	w := serveChi(h, "GET", "/api/tasks", "")
+	pr := parsePaginated(t, w)
+	if pr.TotalCount != 1 {
+		t.Errorf("expected totalCount=1, got %d", pr.TotalCount)
+	}
+}
+
+// ─── Project Tests ─────────────────────────────────────────────────────────────
+
+func TestListProjects_Empty(t *testing.T) {
+	h := testHandler(t)
+	w := serveChi(h, "GET", "/api/projects", "")
+	if w.Code != http.StatusOK {
+		t.Fatalf("expected 200, got %d", w.Code)
+	}
+}
+
+func TestListProjects_WithData(t *testing.T) {
+	h := testHandler(t)
+	h.ProjectStore.Create(models.Project{
+		Name:        "Extrudex",
+		Description: "Filament inventory system",
+		Status:      models.ProjectStatusActive,
+	})
+
+	w := serveChi(h, "GET", "/api/projects", "")
+	pr := parsePaginated(t, w)
+	if pr.TotalCount != 1 {
+		t.Errorf("expected totalCount=1, got %d", pr.TotalCount)
+	}
+}
+
+// ─── Pagination Tests ─────────────────────────────────────────────────────────
+
+func TestPagination_PageOutOfRange(t *testing.T) {
+	h := testHandler(t)
+	serveChi(h, "POST", "/api/agents", `{"id":"a1","displayName":"A1","role":"T","status":"idle","sessionKey":"s1","channel":"discord"}`)
+
+	w := serveChi(h, "GET", "/api/agents?page=99", "")
+	pr := parsePaginated(t, w)
+	if len(pr.Data.([]any)) != 0 {
+		t.Errorf("expected empty page, got %d items", len(pr.Data.([]any)))
+	}
+	// HasMore=false because we're past all data — nothing more to fetch.
+	if pr.HasMore {
+		t.Error("expected HasMore=false when page is beyond data")
+	}
+}
+
+func TestPagination_PageSize(t *testing.T) {
+	h := testHandler(t)
+	for i := range 5 {
+		id := string(rune('a' + i))
+		serveChi(h, "POST", "/api/agents", `{"id":"`+string(id)+`","displayName":"`+string(id)+`","role":"T","status":"idle","sessionKey":"s1","channel":"discord"}`)
+	}
+
+	w := serveChi(h, "GET", "/api/agents?pageSize=2&page=2", "")
+	pr := parsePaginated(t, w)
+	if pr.PageSize != 2 {
+		t.Errorf("expected pageSize=2, got %d", pr.PageSize)
+	}
+}

go-backend/internal/handler/helpers.go

@@ -0,0 +1,106 @@
+package handler
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"strconv"
+	"strings"
+
+	"github.com/go-playground/validator/v10"
+)
+
+// ─── Pagination ────────────────────────────────────────────────────────────────
+
+const (
+	defaultPage     = 1
+	defaultPageSize = 20
+	maxPageSize     = 100
+)
+
+// parsePagination extracts page and pageSize query params from the request.
+func parsePagination(r *http.Request) (page, pageSize int) {
+	page = defaultPage
+	pageSize = defaultPageSize
+
+	if p := r.URL.Query().Get("page"); p != "" {
+		if n, err := strconv.Atoi(p); err == nil && n > 0 {
+			page = n
+		}
+	}
+	if ps := r.URL.Query().Get("pageSize"); ps != "" {
+		if n, err := strconv.Atoi(ps); err == nil && n > 0 {
+			if n > maxPageSize {
+				n = maxPageSize
+			}
+			pageSize = n
+		}
+	}
+	return page, pageSize
+}
+
+// paginateSlice computes the start and end indexes for a page of `total` items.
+// Bounds are clamped to [0, total].
+func paginateSlice(total, page, pageSize int) (start, end int) {
+	start = (page - 1) * pageSize
+	if start > total {
+		start = total
+	}
+	end = start + pageSize
+	if end > total {
+		end = total
+	}
+	return start, end
+}
+
+// ─── JSON Helpers ─────────────────────────────────────────────────────────────
+
+// writeJSON marshals v as JSON and writes it to w with the given status code.
+func writeJSON(w http.ResponseWriter, status int, v any) {
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(status)
+	if v == nil {
+		return
+	}
+	if err := json.NewEncoder(w).Encode(v); err != nil {
+		http.Error(w, `{"error":"internal encoding error"}`, http.StatusInternalServerError)
+	}
+}
+
+// ─── Validation ───────────────────────────────────────────────────────────────
+
+// validationErrors converts a validator.ValidationErrors into a string map
+// suitable for the ErrorResponse details field.
+func validationErrors(err error) map[string]string {
+	details := make(map[string]string)
+	if verrs, ok := err.(validator.ValidationErrors); ok {
+		for _, fe := range verrs {
+			field := strings.ToLower(fe.Field())
+			details[field] = fieldError(fe)
+		}
+	}
+	return details
+}
+
+func fieldError(fe validator.FieldError) string {
+	switch fe.Tag() {
+	case "required":
+		return "this field is required"
+	case "min":
+		return fmt.Sprintf("must be at least %s characters", fe.Param())
+	case "max":
+		return fmt.Sprintf("must be at most %s characters", fe.Param())
+	default:
+		return fmt.Sprintf("failed validation: %s", fe.Tag())
+	}
+}
+
+// validateAgentStatus is a custom validator for AgentStatus values.
+func validateAgentStatus(fl validator.FieldLevel) bool {
+	if status, ok := fl.Field().Interface().(interface {
+		IsValid() bool
+	}); ok {
+		return status.IsValid()
+	}
+	return false
+}

go-backend/internal/handler/project.go

@@ -0,0 +1,28 @@
+package handler
+
+import (
+	"net/http"
+
+	"code.cubecraftcreations.com/CubeCraft-Creations/Control-Center/go-backend/internal/models"
+)
+
+// ─── Project Handlers ──────────────────────────────────────────────────────────
+
+// ListProjects handles GET /api/projects.
+func (h *Handler) ListProjects(w http.ResponseWriter, r *http.Request) {
+	projects := h.ProjectStore.List()
+	if projects == nil {
+		projects = []models.Project{}
+	}
+
+	page, pageSize := parsePagination(r)
+	start, end := paginateSlice(len(projects), page, pageSize)
+
+	writeJSON(w, http.StatusOK, models.PaginatedResponse{
+		Data:       projects[start:end],
+		TotalCount: h.ProjectStore.Count(),
+		Page:       page,
+		PageSize:   pageSize,
+		HasMore:    end < len(projects),
+	})
+}

go-backend/internal/handler/session.go

@@ -0,0 +1,28 @@
+package handler
+
+import (
+	"net/http"
+
+	"code.cubecraftcreations.com/CubeCraft-Creations/Control-Center/go-backend/internal/models"
+)
+
+// ─── Session Handlers ──────────────────────────────────────────────────────────
+
+// ListSessions handles GET /api/sessions.
+func (h *Handler) ListSessions(w http.ResponseWriter, r *http.Request) {
+	sessions := h.SessionStore.ListActive()
+	if sessions == nil {
+		sessions = []models.Session{}
+	}
+
+	page, pageSize := parsePagination(r)
+	start, end := paginateSlice(len(sessions), page, pageSize)
+
+	writeJSON(w, http.StatusOK, models.PaginatedResponse{
+		Data:       sessions[start:end],
+		TotalCount: h.SessionStore.Count(),
+		Page:       page,
+		PageSize:   pageSize,
+		HasMore:    end < len(sessions),
+	})
+}

go-backend/internal/handler/task.go

@@ -0,0 +1,28 @@
+package handler
+
+import (
+	"net/http"
+
+	"code.cubecraftcreations.com/CubeCraft-Creations/Control-Center/go-backend/internal/models"
+)
+
+// ─── Task Handlers ─────────────────────────────────────────────────────────────
+
+// ListTasks handles GET /api/tasks.
+func (h *Handler) ListTasks(w http.ResponseWriter, r *http.Request) {
+	tasks := h.TaskStore.ListRecent()
+	if tasks == nil {
+		tasks = []models.Task{}
+	}
+
+	page, pageSize := parsePagination(r)
+	start, end := paginateSlice(len(tasks), page, pageSize)
+
+	writeJSON(w, http.StatusOK, models.PaginatedResponse{
+		Data:       tasks[start:end],
+		TotalCount: h.TaskStore.Count(),
+		Page:       page,
+		PageSize:   pageSize,
+		HasMore:    end < len(tasks),
+	})
+}

go-backend/internal/models/models.go

@@ -0,0 +1,165 @@
+// Package models defines the domain types and API contracts for the
+// Control Center Go backend. These types map to the existing TypeScript
+// AgentCardData interface and extend it with persistence-focused types
+// for the new session, task, and project entities.
+//
+// All JSON field names use camelCase to match the existing frontend
+// contract established by the .NET backend.
+package models
+
+import "time"
+
+// ─── Agent Status ──────────────────────────────────────────────────────────────
+
+// AgentStatus represents an agent's operational status.
+// Maps to the frontend status values: active, idle, thinking, error.
+type AgentStatus string
+
+const (
+	AgentStatusActive   AgentStatus = "active"
+	AgentStatusIdle     AgentStatus = "idle"
+	AgentStatusThinking AgentStatus = "thinking"
+	AgentStatusError    AgentStatus = "error"
+)
+
+// IsValid reports whether s is a known agent status.
+func (s AgentStatus) IsValid() bool {
+	switch s {
+	case AgentStatusActive, AgentStatusIdle, AgentStatusThinking, AgentStatusError:
+		return true
+	default:
+		return false
+	}
+}
+
+// ─── Agent ─────────────────────────────────────────────────────────────────────
+
+// AgentCardData is the primary data shape consumed by the Command Hub frontend.
+// It matches the TypeScript AgentCardData interface exactly.
+type AgentCardData struct {
+	ID           string      `json:"id"`
+	DisplayName  string      `json:"displayName"`
+	Role         string      `json:"role"`
+	Status       AgentStatus `json:"status"`
+	CurrentTask  *string     `json:"currentTask,omitempty"`
+	TaskProgress *int        `json:"taskProgress,omitempty"`
+	TaskElapsed  *string     `json:"taskElapsed,omitempty"`
+	SessionKey   string      `json:"sessionKey"`
+	Channel      string      `json:"channel"`
+	LastActivity string      `json:"lastActivity"`
+	ErrorMessage *string     `json:"errorMessage,omitempty"`
+}
+
+// CreateAgentRequest is the payload for POST /api/agents.
+type CreateAgentRequest struct {
+	ID          string      `json:"id" validate:"required,min=2,max=64"`
+	DisplayName string      `json:"displayName" validate:"required,min=1,max=128"`
+	Role        string      `json:"role" validate:"required,min=1,max=256"`
+	Status      AgentStatus `json:"status" validate:"required,agentStatus"`
+	SessionKey  string      `json:"sessionKey" validate:"required,min=1"`
+	Channel     string      `json:"channel" validate:"required,min=1,max=32"`
+	CurrentTask *string     `json:"currentTask,omitempty"`
+}
+
+// UpdateAgentRequest is the payload for PUT /api/agents/{id}.
+type UpdateAgentRequest struct {
+	Status       *AgentStatus `json:"status,omitempty" validate:"omitempty,agentStatus"`
+	CurrentTask  *string      `json:"currentTask,omitempty"`
+	TaskProgress *int         `json:"taskProgress,omitempty" validate:"omitempty,min=0,max=100"`
+	TaskElapsed  *string      `json:"taskElapsed,omitempty"`
+	Channel      *string      `json:"channel,omitempty" validate:"omitempty,min=1,max=32"`
+	ErrorMessage *string      `json:"errorMessage,omitempty"`
+}
+
+// AgentStatusHistoryEntry represents a point-in-time status change for an agent.
+type AgentStatusHistoryEntry struct {
+	ID        string      `json:"id"`
+	AgentID   string      `json:"agentId"`
+	Status    AgentStatus `json:"status"`
+	Task      *string     `json:"task,omitempty"`
+	Timestamp string      `json:"timestamp"`
+}
+
+// ─── Session ───────────────────────────────────────────────────────────────────
+
+// Session represents an active agent session tracked by the system.
+type Session struct {
+	ID             string    `json:"id"`
+	SessionKey     string    `json:"sessionKey"`
+	AgentID        string    `json:"agentId"`
+	Channel        string    `json:"channel"`
+	Status         string    `json:"status"` // running, done, streaming, error
+	ContextTokens  int       `json:"contextTokens"`
+	TotalTokens    int       `json:"totalTokens"`
+	EstimatedCost  float64   `json:"estimatedCost"`
+	Model          string    `json:"model"`
+	StartedAt      time.Time `json:"startedAt"`
+	LastActivityAt time.Time `json:"lastActivityAt"`
+}
+
+// ─── Task ───────────────────────────────────────────────────────────────────────
+
+// TaskStatus represents the lifecycle state of a tracked task.
+type TaskStatus string
+
+const (
+	TaskStatusPending   TaskStatus = "pending"
+	TaskStatusRunning   TaskStatus = "running"
+	TaskStatusCompleted TaskStatus = "completed"
+	TaskStatusFailed    TaskStatus = "failed"
+)
+
+// Task represents a tracked task assigned to an agent.
+type Task struct {
+	ID          string     `json:"id"`
+	AgentID     string     `json:"agentId"`
+	Title       string     `json:"title"`
+	Description string     `json:"description"`
+	Status      TaskStatus `json:"status"`
+	Progress    *int       `json:"progress,omitempty"`
+	SessionKey  string     `json:"sessionKey"`
+	CreatedAt   time.Time  `json:"createdAt"`
+	UpdatedAt   time.Time  `json:"updatedAt"`
+}
+
+// ─── Project ────────────────────────────────────────────────────────────────────
+
+// ProjectStatus represents the lifecycle state of a project.
+type ProjectStatus string
+
+const (
+	ProjectStatusPlanned   ProjectStatus = "planned"
+	ProjectStatusActive    ProjectStatus = "active"
+	ProjectStatusPaused    ProjectStatus = "paused"
+	ProjectStatusCompleted ProjectStatus = "completed"
+)
+
+// Project represents a project tracked in the system.
+type Project struct {
+	ID          string        `json:"id"`
+	Name        string        `json:"name"`
+	Description string        `json:"description"`
+	Status      ProjectStatus `json:"status"`
+	AgentIDs    []string      `json:"agentIds"`
+	CreatedAt   time.Time     `json:"createdAt"`
+	UpdatedAt   time.Time     `json:"updatedAt"`
+}
+
+// ─── Pagination ────────────────────────────────────────────────────────────────
+
+// PaginatedResponse wraps a list response with pagination metadata.
+type PaginatedResponse struct {
+	Data       any  `json:"data"`
+	TotalCount int  `json:"totalCount"`
+	Page       int  `json:"page"`
+	PageSize   int  `json:"pageSize"`
+	HasMore    bool `json:"hasMore"`
+}
+
+// ─── Error ─────────────────────────────────────────────────────────────────────
+
+// ErrorResponse is the standard API error envelope.
+type ErrorResponse struct {
+	Error   string            `json:"error"`
+	Details map[string]string `json:"details,omitempty"`
+}

go-backend/internal/router/router.go

@@ -0,0 +1,65 @@
+// Package router configures the chi router with all routes, middleware,
+// and handler wiring for the Control Center API.
+package router
+
+import (
+	"net/http"
+	"time"
+
+	"code.cubecraftcreations.com/CubeCraft-Creations/Control-Center/go-backend/internal/handler"
+	"github.com/go-chi/chi/v5"
+	"github.com/go-chi/chi/v5/middleware"
+	"github.com/go-chi/cors"
+)
+
+// New creates a fully-configured chi router with all API routes mounted.
+func New(h *handler.Handler) *chi.Mux {
+	r := chi.NewRouter()
+
+	// ── Global middleware ──────────────────────────────────────────────────
+	r.Use(middleware.RequestID)
+	r.Use(middleware.RealIP)
+	r.Use(middleware.Logger)
+	r.Use(middleware.Recoverer)
+	r.Use(middleware.Timeout(30 * time.Second))
+
+	// ── CORS — permissive for development ──────────────────────────────────
+	r.Use(cors.Handler(cors.Options{
+		AllowedOrigins:   []string{"*"},
+		AllowedMethods:   []string{"GET", "POST", "PUT", "DELETE", "OPTIONS"},
+		AllowedHeaders:   []string{"Accept", "Authorization", "Content-Type"},
+		ExposedHeaders:   []string{"Link", "X-Total-Count"},
+		AllowCredentials: false,
+		MaxAge:           300,
+	}))
+
+	// ── Health check ───────────────────────────────────────────────────────
+	r.Get("/health", func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "application/json")
+		w.Write([]byte(`{"status":"ok"}`))
+	})
+
+	// ── API v1 routes ──────────────────────────────────────────────────────
+	r.Route("/api", func(api chi.Router) {
+		// Agents CRUD
+		api.Route("/agents", func(agents chi.Router) {
+			agents.Get("/", h.ListAgents)       // GET /api/agents
+			agents.Post("/", h.CreateAgent)      // POST /api/agents
+			agents.Get("/{id}", h.GetAgent)       // GET /api/agents/{id}
+			agents.Put("/{id}", h.UpdateAgent)    // PUT /api/agents/{id}
+			agents.Delete("/{id}", h.DeleteAgent) // DELETE /api/agents/{id}
+			agents.Get("/{id}/history", h.AgentHistory) // GET /api/agents/{id}/history
+		})
+
+		// Sessions
+		api.Get("/sessions", h.ListSessions)
+
+		// Tasks
+		api.Get("/tasks", h.ListTasks)
+
+		// Projects
+		api.Get("/projects", h.ListProjects)
+	})
+
+	return r
+}

go-backend/internal/store/agent.go

@@ -0,0 +1,177 @@
+// Package store provides thread-safe in-memory data stores for the
+// Control Center API. These will be replaced with PostgreSQL-backed
+// implementations once CUB-120 (schema design) is complete.
+package store
+
+import (
+	"sort"
+	"sync"
+	"time"
+
+	"code.cubecraftcreations.com/CubeCraft-Creations/Control-Center/go-backend/internal/models"
+	"github.com/google/uuid"
+)
+
+// AgentStore provides thread-safe CRUD operations for agents.
+type AgentStore struct {
+	mu      sync.RWMutex
+	agents  map[string]models.AgentCardData
+	history map[string][]models.AgentStatusHistoryEntry // agentID -> history
+}
+
+// NewAgentStore returns an initialized AgentStore.
+func NewAgentStore() *AgentStore {
+	return &AgentStore{
+		agents:  make(map[string]models.AgentCardData),
+		history: make(map[string][]models.AgentStatusHistoryEntry),
+	}
+}
+
+// List returns all agents, optionally filtered by status.
+func (s *AgentStore) List(statusFilter models.AgentStatus) []models.AgentCardData {
+	s.mu.RLock()
+	defer s.mu.RUnlock()
+
+	result := make([]models.AgentCardData, 0, len(s.agents))
+	for _, a := range s.agents {
+		if statusFilter != "" && a.Status != statusFilter {
+			continue
+		}
+		result = append(result, a)
+	}
+
+	// Sort by display name for consistent output.
+	sort.Slice(result, func(i, j int) bool {
+		return result[i].DisplayName < result[j].DisplayName
+	})
+	return result
+}
+
+// Get returns a single agent by ID, or false if not found.
+func (s *AgentStore) Get(id string) (models.AgentCardData, bool) {
+	s.mu.RLock()
+	defer s.mu.RUnlock()
+	a, ok := s.agents[id]
+	return a, ok
+}
+
+// Create inserts a new agent. Returns false if the ID already exists.
+func (s *AgentStore) Create(a models.AgentCardData) bool {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	if _, exists := s.agents[a.ID]; exists {
+		return false
+	}
+	if a.LastActivity == "" {
+		a.LastActivity = time.Now().UTC().Format(time.RFC3339)
+	}
+	s.agents[a.ID] = a
+
+	// Record initial history entry.
+	s.appendHistoryLocked(a.ID, models.AgentStatusHistoryEntry{
+		ID:        uuid.New().String(),
+		AgentID:   a.ID,
+		Status:    a.Status,
+		Task:      a.CurrentTask,
+		Timestamp: a.LastActivity,
+	})
+	return true
+}
+
+// Update applies partial updates to an agent. Returns the updated agent or false if not found.
+func (s *AgentStore) Update(id string, req models.UpdateAgentRequest) (models.AgentCardData, bool) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+
+	a, ok := s.agents[id]
+	if !ok {
+		return models.AgentCardData{}, false
+	}
+
+	prevStatus := a.Status
+	prevTask := a.CurrentTask
+
+	if req.Status != nil {
+		a.Status = *req.Status
+	}
+	if req.CurrentTask != nil {
+		a.CurrentTask = req.CurrentTask
+	}
+	if req.TaskProgress != nil {
+		a.TaskProgress = req.TaskProgress
+	}
+	if req.TaskElapsed != nil {
+		a.TaskElapsed = req.TaskElapsed
+	}
+	if req.Channel != nil {
+		a.Channel = *req.Channel
+	}
+	if req.ErrorMessage != nil {
+		a.ErrorMessage = req.ErrorMessage
+	}
+	a.LastActivity = time.Now().UTC().Format(time.RFC3339)
+	s.agents[id] = a
+
+	// Record history entry if status or task changed.
+	if (req.Status != nil && *req.Status != prevStatus) || (req.CurrentTask != nil && prevTask == nil) ||
+		(req.CurrentTask != nil && prevTask != nil && *req.CurrentTask != *prevTask) {
+		status := a.Status
+		if req.Status != nil {
+			status = *req.Status
+		}
+		s.appendHistoryLocked(id, models.AgentStatusHistoryEntry{
+			ID:        uuid.New().String(),
+			AgentID:   id,
+			Status:    status,
+			Task:      a.CurrentTask,
+			Timestamp: a.LastActivity,
+		})
+	}
+
+	return a, true
+}
+
+// Delete removes an agent. Returns true if the agent existed.
+func (s *AgentStore) Delete(id string) bool {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	if _, ok := s.agents[id]; !ok {
+		return false
+	}
+	delete(s.agents, id)
+	delete(s.history, id)
+	return true
+}
+
+// History returns the status history for an agent, newest first.
+func (s *AgentStore) History(agentID string) []models.AgentStatusHistoryEntry {
+	s.mu.RLock()
+	defer s.mu.RUnlock()
+
+	entries, ok := s.history[agentID]
+	if !ok {
+		return nil
+	}
+	// Return a defensive copy, sorted newest first (by index when timestamps tie).
+	result := make([]models.AgentStatusHistoryEntry, len(entries))
+	copy(result, entries)
+	sort.SliceStable(result, func(i, j int) bool {
+		if result[i].Timestamp == result[j].Timestamp {
+			return i > j // later index = newer when timestamps match
+		}
+		return result[i].Timestamp > result[j].Timestamp
+	})
+	return result
+}
+
+// Count returns the total number of agents.
+func (s *AgentStore) Count() int {
+	s.mu.RLock()
+	defer s.mu.RUnlock()
+	return len(s.agents)
+}
+
+// appendHistoryLocked adds a history entry. Caller must hold s.mu (write lock).
+func (s *AgentStore) appendHistoryLocked(agentID string, entry models.AgentStatusHistoryEntry) {
+	s.history[agentID] = append(s.history[agentID], entry)
+}

go-backend/internal/store/project.go

@@ -0,0 +1,67 @@
+package store
+
+import (
+	"sort"
+	"sync"
+	"time"
+
+	"code.cubecraftcreations.com/CubeCraft-Creations/Control-Center/go-backend/internal/models"
+	"github.com/google/uuid"
+)
+
+// ProjectStore provides thread-safe CRUD operations for projects.
+type ProjectStore struct {
+	mu       sync.RWMutex
+	projects map[string]models.Project
+}
+
+// NewProjectStore returns an initialized ProjectStore.
+func NewProjectStore() *ProjectStore {
+	return &ProjectStore{
+		projects: make(map[string]models.Project),
+	}
+}
+
+// List returns all projects ordered by name.
+func (s *ProjectStore) List() []models.Project {
+	s.mu.RLock()
+	defer s.mu.RUnlock()
+
+	result := make([]models.Project, 0, len(s.projects))
+	for _, p := range s.projects {
+		result = append(result, p)
+	}
+	sort.Slice(result, func(i, j int) bool {
+		return result[i].Name < result[j].Name
+	})
+	return result
+}
+
+// Create inserts a new project.
+func (s *ProjectStore) Create(p models.Project) models.Project {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+
+	if p.ID == "" {
+		p.ID = uuid.New().String()
+	}
+	now := time.Now().UTC()
+	if p.CreatedAt.IsZero() {
+		p.CreatedAt = now
+	}
+	if p.UpdatedAt.IsZero() {
+		p.UpdatedAt = now
+	}
+	if p.AgentIDs == nil {
+		p.AgentIDs = []string{}
+	}
+	s.projects[p.ID] = p
+	return p
+}
+
+// Count returns the total number of projects.
+func (s *ProjectStore) Count() int {
+	s.mu.RLock()
+	defer s.mu.RUnlock()
+	return len(s.projects)
+}

go-backend/internal/store/session.go

@@ -0,0 +1,80 @@
+package store
+
+import (
+	"sort"
+	"sync"
+	"time"
+
+	"code.cubecraftcreations.com/CubeCraft-Creations/Control-Center/go-backend/internal/models"
+	"github.com/google/uuid"
+)
+
+// SessionStore provides thread-safe CRUD operations for sessions.
+type SessionStore struct {
+	mu       sync.RWMutex
+	sessions map[string]models.Session // id -> session
+}
+
+// NewSessionStore returns an initialized SessionStore.
+func NewSessionStore() *SessionStore {
+	return &SessionStore{
+		sessions: make(map[string]models.Session),
+	}
+}
+
+// ListActive returns all sessions with status "running" or "streaming", newest first.
+func (s *SessionStore) ListActive() []models.Session {
+	s.mu.RLock()
+	defer s.mu.RUnlock()
+
+	result := make([]models.Session, 0)
+	for _, sess := range s.sessions {
+		if sess.Status == "running" || sess.Status == "streaming" {
+			result = append(result, sess)
+		}
+	}
+	sort.Slice(result, func(i, j int) bool {
+		return result[i].LastActivityAt.After(result[j].LastActivityAt)
+	})
+	return result
+}
+
+// Create inserts a new session.
+func (s *SessionStore) Create(sess models.Session) models.Session {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+
+	if sess.ID == "" {
+		sess.ID = uuid.New().String()
+	}
+	if sess.StartedAt.IsZero() {
+		sess.StartedAt = time.Now().UTC()
+	}
+	if sess.LastActivityAt.IsZero() {
+		sess.LastActivityAt = sess.StartedAt
+	}
+	s.sessions[sess.ID] = sess
+	return sess
+}
+
+// UpdateStatus updates the status and last-activity timestamp of a session.
+func (s *SessionStore) UpdateStatus(id, status string) bool {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+
+	sess, ok := s.sessions[id]
+	if !ok {
+		return false
+	}
+	sess.Status = status
+	sess.LastActivityAt = time.Now().UTC()
+	s.sessions[id] = sess
+	return true
+}
+
+// Count returns the total number of sessions.
+func (s *SessionStore) Count() int {
+	s.mu.RLock()
+	defer s.mu.RUnlock()
+	return len(s.sessions)
+}

go-backend/internal/store/task.go

@@ -0,0 +1,64 @@
+package store
+
+import (
+	"sort"
+	"sync"
+	"time"
+
+	"code.cubecraftcreations.com/CubeCraft-Creations/Control-Center/go-backend/internal/models"
+	"github.com/google/uuid"
+)
+
+// TaskStore provides thread-safe CRUD operations for tasks.
+type TaskStore struct {
+	mu    sync.RWMutex
+	tasks map[string]models.Task
+}
+
+// NewTaskStore returns an initialized TaskStore.
+func NewTaskStore() *TaskStore {
+	return &TaskStore{
+		tasks: make(map[string]models.Task),
+	}
+}
+
+// ListRecent returns tasks ordered by updated_at descending (newest first).
+func (s *TaskStore) ListRecent() []models.Task {
+	s.mu.RLock()
+	defer s.mu.RUnlock()
+
+	result := make([]models.Task, 0, len(s.tasks))
+	for _, t := range s.tasks {
+		result = append(result, t)
+	}
+	sort.Slice(result, func(i, j int) bool {
+		return result[i].UpdatedAt.After(result[j].UpdatedAt)
+	})
+	return result
+}
+
+// Create inserts a new task.
+func (s *TaskStore) Create(t models.Task) models.Task {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+
+	if t.ID == "" {
+		t.ID = uuid.New().String()
+	}
+	now := time.Now().UTC()
+	if t.CreatedAt.IsZero() {
+		t.CreatedAt = now
+	}
+	if t.UpdatedAt.IsZero() {
+		t.UpdatedAt = now
+	}
+	s.tasks[t.ID] = t
+	return t
+}
+
+// Count returns the total number of tasks.
+func (s *TaskStore) Count() int {
+	s.mu.RLock()
+	defer s.mu.RUnlock()
+	return len(s.tasks)
+}