wip: L174 Design50 steps 0-2 verified; v240 baselines; seams proven real (RED)

End runs pass 48/48; overlap/turn census still fails; seam mismatches are real
(one tile adds the passage carve, its neighbour's X8 fast path does not).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016dhxM43dnWvUu2B5Ph1iG1

Standalone/Tools/verify/baselines/README.md

@@ -11,3 +11,7 @@ verification gates. The gates now read this tracked directory instead of
 - `mouth/`: L35–L37 mouth-shape controls.
 - `ring/`: L30/L31 negative ring controls.
 - `capture/`: L34 reference camera records.
+- `owner-hash/canonical/owner-hash-*-v239.baseline`: L173 geometry before the L174
+  level-end-run and passage-overlap changes.
+- `owner-hash/canonical/owner-hash-*-v240.baseline`: L174 canonical owner hashes after
+  Design50 steps 1–2; step 0 retained the v239 geometry and hashes.