docs: record collision/seam audit evidence; close release check 3

MEMORY.md

@@ -304,3 +304,18 @@ Scope: facts and traps that cost time to establish. Planned work lives in [TODO.
 - Getting actor world bounds: spawn at loc(0,0,0) means static mesh bbox IS the
   world footprint (FBX carries the geo offset). Probe by loading the level
   explicitly (load_level) — a fresh commandlet starts on Untitled otherwise.
+
+## 2026-11-08 — collision/seam audit done; QA self-test extended
+
+- `-qaselftest` transect widened from 84 samples (3 lane centres) to **1456
+  samples / 16 rows** including kerb/road/sidewalk seam Ys (probed: N side
+  -1912..-1053, kerb -1382..-1053, road -1382..+1047, kerb +718..+1047, S side
+  +718..+1447). 0 holes.
+- **New wall probe:** ground-referenced horizontal 30 m trace at +160 cm. First
+  attempt used a fixed Z 160 and started INSIDE the earth (street is at Z ~366)
+  -> every row reported a dist-0 blocker. Always ground the probe first.
+- **Guard:** GigLineShotActor must skip rounds under `-qaselftest`, else
+  bQuitWhenDone closes the game before the transect phase (observed: game exited
+  at t=2s with "ShotActor: done (4 shots)" + RequestExit).
+- Results on packaged build: walk 761cm/2s, reset 0cm, pause/unpause, transect
+  0 holes, wall 0/35 -> all PASS. Evidence recorded in Docs/release-checks.md.