qa(claim): claim no-blocking-collision release check (seam + wall audit)

Plan: extend qaselftest with (a) vertical transect rows at the road/kerb/
sidewalk seam boundaries, (b) horizontal walk-height probes to catch invisible
walls or blocking geometry in the street envelope, then run on the packaged
build and record evidence. Branch collision-seams-0.1.0.

TODO.md

@@ -106,11 +106,11 @@ The MPFB character asset is planned as the NPC template (see `ROADMAP.md`). Keep
 - [x] Commit and review the publication preparation changes before pushing. Initial publication commit: `101db3f`.
 - [x] Review ODbL obligations for each shipped derivative database or produced work before public release. **Done 2026-11-08** — full review recorded in `Docs/odbl-review.md`: the shipped streets/footprints/sidewalks are a Produced Work of the OpenStreetMap database; obligations held are on-screen attribution (`AGigLineHUD`), the ODbL link, and the committed source extract with provenance; share-alike applies to the data layer only (project code/art stay CC0). THIRD_PARTY_NOTICES and `Docs/licensing.md` updated.
 
-### Release checks - active - 01a1b26b-3c94-707f-9665-2f6b4a79b564 (branch `placement-reference-0.1.0`)
+### Release checks - active - 01a1b26b-3c94-707f-9665-2f6b4a79b564 (branch `collision-seams-0.1.0`)
 
 - [x] Player can traverse both sides of the demo without falling through geometry. **Verified 2026-11-08:** Blender pre-check plus an in-engine swept transect (`-qaselftest`) over the north sidewalk, carriageway and south sidewalk from X -14900 to -9420 — 84 samples, 0 holes, ground Z 317..395 (sidewalk 395, road 366, south walk 317). The player spawns at Z 456 and stays there for the whole run (`fall=0`, single Z).
 - [x] Building placement, street scale, and site identity checked against references. **Done 2026-11-08:** rendered current DemoMap content, probed world-space geometry (road 24.3 m vs ref 20.9–25.9 m; sidewalk centreline offsets 12.5/13.2 vs ref 12.6/13.6 m; hero frontage 26.0 m, setback ~13 m vs ref 25.75/14.5 m; frontage + north buildings in verified OSM positions), recorded PASS + deliberate deviations (flat blockout surfaces → `0.1.4`, kerb upstand → `0.1.1`, kerb-flush ramps → `0.1.1`) in `Docs/release-checks.md`, and fixed the mis-aimed north-buildings camera (was 9.5 km west → 85% sky; now frames the buildings). Final human verdict pending on `Screenshots/demo/*`.
-- [ ] No blocking collision or packaging defects.
+- [A] No blocking collision or packaging defects. Extend the `-qaselftest` transect with seam samples (road↔kerb↔sidewalk boundaries at Y −1382/−1053/+718/+1047 and the crossing edges) and a horizontal walk-height probe for invisible walls / blocking meshes; run on the packaged build and record evidence in `Docs/release-checks.md`.
 - [ ] Remove TEMP QA diagnostics (`GigLine SIM` / `GigLine GROUND` log lines and the settle-timer log) from `GigLineCharacter.cpp` before the release tag, or gate them behind a cvar.
 - [ ] 60 FPS at 1440p on the dev workstation (Bazzite, Ryzen 7 7700X, 64 GB RAM, RTX 5070 Ti 16 GB) using a documented quality preset; record upscaling state; report performance without frame generation.
 - [ ] Fresh project checkout builds with the documented external engine installation.