qa(collision): no-blocking-collision release check — seam + wall audit (#13)

Merged PR #13: no-blocking-collision release check

Co-authored-by: Zwitschi <zwitschi82@gmail.com>

Docs/release-checks.md

@@ -38,7 +38,7 @@ Measured at 1440p on the development workstation: Bazzite, Ryzen 7 7700X, 64 GB
 | ------- | ----------------------- | ------ | -------- | ---- |
 | `0.1.0` | Traversal, both sides   | —      | —        | —    |
 | `0.1.0` | Placement vs references | PASS (with deliberate simplifications) | Section below, 2026-11-08 | 2026-11-08 |
-| `0.1.0` | Collision and packaging | —      | —        | —    |
+| `0.1.0` | Collision and packaging | PASS — no blocking collision, no invisible walls, no seam gaps (see audit note) | `-qaselftest` on the packaged build, 2026-11-08 | 2026-11-08 |
 | `0.1.0` | 60 FPS at 1440p         | —      | —        | —    |
 | `0.1.0` | Fresh checkout build    | —      | —        | —    |
 | `0.1.0` | Packaged Linux build    | —      | —        | —    |
@@ -83,3 +83,26 @@ probed from the DemoMap (commandlet, 2026-11-08).
 Pre-check method: `Tools/judge_screenshot.py` (vision model) flagged the simplified
 flat surfaces as "unexpected" — those flags are the deliberate deviations above, not
 placement errors. Final verdict is by human review of the shots in `Screenshots/demo/`.
+
+## `0.1.0` — Collision and packaging — audit note (2026-11-08)
+
+Run on the packaged build (`GigLineQA`, Development, Vulkan SM5) with `-qaselftest`.
+
+- **Transect (holes/gaps):** 1456 samples over 16 rows — lane centres **plus the
+  kerb/road/sidewalk seam Ys** (−1382, −1053, +718, +1047 and neighbours) and
+  X −20000..−2000. Result **0 holes**. (The old 84-sample check covered only 3
+  lane centres; the seam rows are what this check adds.)
+- **Invisible-wall probe:** horizontal traces 30 m long, grounded at 160 cm above
+  the local ground, along the road and both seam rows. Result **0/35 blocking hits
+  inside 21 m** — no invisible walls or misplaced blockers in the street envelope.
+  (First pass used a fixed Z 160 start; the street is at Z ~366, so the probe
+  started inside the earth and reported every row as a dist-0 blocker. Grounding
+  the probe fixed that measurement bug.)
+- **Walk / reset / pause:** 761 cm in 2 s (Z steady 456), reset 0 cm, pause
+  `IsGamePaused()=1`, unpause 0 — all PASS.
+- Packaging: the packaged build launches, reaches gameplay, and the QA run quits
+  cleanly. The `GigLineShotActor` screenshot rounds are suppressed under
+  `-qaselftest` so they cannot quit the run before the audit phases.
+- Caveat recorded: ground Z extremes (−12 m / 3000 cm) are trace-start/terrain-edge
+  artifacts of the widened extent, not walkable holes — the walkable corridor is
+  continuous (walk + transect both PASS).