fix: make camera node strap loops vertical

hardware/DESIGN_PIPELINE.md

@@ -25,7 +25,7 @@
 - Stand-mounted upright camera node enclosure; the case still does **not** mount to the GoPro.
 - Visual direction now matches the original green appliance-style reference: tall vertical body, large inset front panel, centered OLED near the upper third, blank middle area, two long rounded lower slots, bottom USB-C female power input, and right-side USB-A female passthrough power port for the GoPro.
 - This replaces the rejected wide/low generic electronics-box layout from the first v4 attempt.
-- Primary mounting is reusable cloth zip ties / Velcro straps through low-profile external rear belt-loop channels, not a clamp/dovetail.
+- Primary mounting is reusable cloth zip ties / Velcro straps through two low-profile vertical rear pass-through loops, not a clamp/dovetail.
 - Front has a recessed/flush full-height service lid similar to a field-service status panel.
 - Lid includes cutouts for:
   - 1.3-inch OLED/status screen.
@@ -34,7 +34,7 @@
   - small rocker on/off switch.
   - two long rounded lower front slots styled after the reference.
 - Front-panel screen, LED, rocker, and lower-slot openings are actual through-cuts through the full lid and locating lip so the back side of the printed lid is not skinned over.
-- Body includes screw bosses, recessed lid pocket, lid locating geometry, a bottom USB-C female power inlet cutout, a right-side USB-A female passthrough power cutout, and two rear horizontal external belt-loop strap channels to resist rotation on a stand.
+- Body includes screw bosses, recessed lid pocket, lid locating geometry, a bottom USB-C female power inlet cutout, a right-side USB-A female passthrough power cutout, and two vertical external rear zip-tie/Velcro pass-through loops to resist rotation on a stand.
 - Internal envelope is sized for known module dimensions plus service clearance:
   - ESP32-C3 Super Mini: 22.5 × 18 mm.
   - ESP-01S: ~24.7 × 14.3 × 12 mm.
@@ -73,10 +73,11 @@ BAT 87%  LINK OK
   - pilot diameter, screw length, and head/counterbore diameter.
 - Mounting straps:
   - cloth zip-tie / Velcro width and thickness.
+  - prototype rear loop tunnel: ~6.4 mm usable strap width × ~3.8 mm strap-thickness clearance, with each visible vertical bracket ~8.5 mm wide × 50 mm tall.
   - whether two strap paths are enough to prevent case rotation on the expected stand diameter.
-  - whether rear bridge edges need larger radii or TPU/silicone sleeve protection.
+  - whether rear vertical loop edges need larger radii or TPU/silicone sleeve protection.
 - Printability:
-  - rear strap bridge bridging/support behavior.
+  - rear vertical zip-tie loop side-pad/bridge strength and whether the top-to-bottom pass-through tunnels print cleanly without supports.
   - body/lid fit after PETG shrinkage.
   - lid lip clearance and screw boss robustness.
   - USB-C/USB-A cutout edge quality, wall strength, and connector retention/strain relief.
@@ -90,7 +91,7 @@ openscad -o /tmp/camera-node-case-v4-preview.stl hardware/case/camera-node-case-
 openscad -o /tmp/camera-node-case-v4-front-review.stl hardware/case/camera-node-case-v4-front-review.scad
 ```
 
-Latest validation: OpenSCAD reports `Simple: yes`; trimesh confirms body, lid, preview, and front-review STLs are watertight. Body and lid each export as a single connected printable component; preview includes separate non-print board guide volumes by design.
+Latest validation: OpenSCAD reports `Simple: yes`; trimesh confirms body, lid, preview, and front-review STLs are watertight. Body and lid each export as a single connected printable component; preview includes separate non-print board guide volumes by design. A rear-loop sanity check confirms both vertical brackets have clear non-solid pass-through tunnel volumes behind the raised bridges.
 
 Or with the main parametric selector:
 
@@ -119,7 +120,7 @@ openscad -D 'part="front_review"' -o /tmp/camera-node-case-v4-front-review.stl h
 
 - User requested front status/service panel with OLED, LEDs, and rocker switch.
 - Single RGB status LED replaces separate red/green status LEDs.
-- Strap channels are simpler and more adaptable than a dedicated clamp/dovetail for field stands.
+- Rear strap pass-through loops are simpler and more adaptable than a dedicated clamp/dovetail for field stands.
 
 ## Backlog