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Erik f29c9d5e61 docs(research): A6.P3 #98 — comparison harness findings + neighborhood fixtures 
Session-end documentation for the 2026-05-23 evening session in
which:

1. The PhysicsResolveCapture apparatus shipped (committed earlier
   in fb5fba6).
2. A live capture (41K records) drove the first LiveCompare_* tests
   in CellarUpTrajectoryReplayTests, two of which PASS bit-perfect.
3. The failing third test pinpointed the cap-event divergence.
4. A second capture (70K records + 16 cell dumps + per-poly probes)
   identified the cottage GfxObj 0xA9B47900 as the blocker — a
   landblock-baked static building whose floor polygons live in the
   GfxObj's BSP, NOT in any cottage cell.

The findings doc has:
- TL;DR + chronological commits
- Apparatus inventory (PhysicsResolveCapture, comparison tests,
  fixtures, launch scripts)
- The math: head sphere top at Z=foot+1.68 reaches the cottage floor
  at Z=94.0 when foot Z=92.74, matching the observed cap.
- User's confirming observation (cap fires on pure-vertical jump too,
  ruling out every step-up / AdjustOffset hypothesis)
- What's NOT yet known (why retail doesn't have this cap; full
  cottage GfxObj polygon list)
- Next-session pickup with two ranked options

Adds:
- docs/research/2026-05-23-a6-p3-issue98-comparison-harness-findings.md
- launch-a6-issue98-capture.ps1 (capture-only launch)
- launch-a6-issue98-polydump.ps1 (capture + diagnostic probes + 16-cell dump)
- 13 new cell-dump fixtures (0xA9B40140-0xA9B40142, 0xA9B40144,
  0xA9B40145, 0xA9B40148-0xA9B4014F) at 272 KB total. The harness now
  has the full 0xA9B4014X neighborhood available for any future
  comparison test that needs adjacent cell geometry.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-05-23 20:12:43 +02:00

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