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capture(research): A6.P3 slice 1 — scen2 postfix proves stairs now work

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Unexpected slice 1 win: the synthesis-strip + Mechanism B (LKCP
restore) fix didn't just close Finding 2 (CP-write blowup) — it also
unblocked stair-walking, which A6.P2 had categorized as Finding 1+3
territory expected to need separate fixes. User reports walking up
and down the inn stairs multiple times in acdream post-fix.

Shape shift in tag distribution:

  Tag                  Pre-fix (FAIL)  Post-fix (SUCCESS)  Signal
  ----                 -------------   ------------------  ------
  indoor-walkable        859              0                synthesis gone
  push-back-cell        1478            879 (-40%)         multi-cell relaxed
  push-back               51            345 (+577%)        real step-up firing
  push-back-disp        4156           6055 (+46%)         real traversal
  cp-write             33969          57846                L622 seed (slice 2)

Pre-fix: synthesis firing while physics hammers BSP trying to resolve
stair-step (failure mode). Post-fix: real BSP queries succeeding, real
step-up + step-down landing. Same shape as retail's stair-climb
(retail scen2: BP2 step_up=188, push-back-disp dominates).

A6.P2 Finding 1 (dispatcher entry frequency mismatch) hypothesis was
"likely secondary effect of Finding 2 — may close as side effect of
the fix." Confirmed empirically: dispatcher activity now matches
retail-like shape without explicit Finding 1 work.

Remaining (slice 2 territory):
- L622 per-tick PhysicsEngine.ResolveWithTransition seed fires 99.3%
  of remaining cp-writes; retail's equivalent fires zero times on
  flat-floor walks. Gate this seed to close the remaining CP-write
  gap.
- Phantom collisions + occasional fall-through on 2nd floor reported
  by user during happy-testing. New issue to file.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
Erik 2026-05-22 10:07:35 +02:00
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