wip: L175 fix tile seams - passage-affected X8 lanes use the composed path (v241, RED)

Seam audit: 0 mismatches over 16 seeds (99,269 pairs, 121.6M shared samples),
injected control detected. Step-2 overlap/turn failures remain. Mainline has the
same dispatch structure (not changed).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_011g9Ez42ZNqQGjigc4FWDih

Standalone/Tools/verify/baselines/README.md

@@ -15,3 +15,5 @@ verification gates. The gates now read this tracked directory instead of
   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.
+- `owner-hash/canonical/owner-hash-*-v241.baseline`: L175 canonical owner hashes after
+  passage composition was made consistent across tile seams.