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close #127 (user-gated + desk pin): distant-building flood flap died with the W=0 clip port

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User re-gate 2026-06-12: ran past distant buildings, 'Seems to have
been fixed' - no flicker/vanish. The per-building flood-admission
bistability (#127, the building-flap mechanism behind the tower roof
flap and #123 'buildings vanish when running past') is gone.

Root: the bistable knife-edge admission died with the W=0
polyClipFinish clip port (987313a - the #119/#120 work that 'kills the
knife-edge class everywhere') plus the #120 containment-rejection
growth fix. The captured-pair evidence (tower-viewer-capture.log,
2026-06-11) PRE-dates all of those - it was that same near-eye knife
edge, not a separate distant mechanism.

Desk confirmation (both green at HEAD):
- CapturedFlipPair_AdmissionIsStable: the original 4 cm flip pair is
  now |A|=|B| with zero diff across all FOVs and both pre-gate states.
- DistantBuildingStrafe_NoAdmissionChurn (new regression pin): 0
  admission churn across all 21 building groups x {10,30,60,120,190} m
  x 100 mm-step run-past strafes, both pre-gate states. A stable flood
  toggles each cell at most once over a monotone eye path; this asserts
  no cell toggles >=2x.

ISSUES.md #127 -> CLOSED with the DO-NOT-RETRY note (no re-opening the
BuildFromExterior seed gates for a flap symptom without a fresh HEAD
repro - the captured-pair lead is dead). Render digest banner updated.

Suites: App 264+1skip / Core 1443+2skip / UI 420 / Net 294.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Erik 2026-06-13 10:03:33 +02:00
parent bf800677f0
commit 4ad6fb9184
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@ -4460,8 +4460,21 @@ not raw terrain. Note the snap line even shows a candidate it rejected
## #127 — Per-building flood admissions are BISTABLE per frame under the outdoor root (the building-flap mechanism)
**Status:** OPEN — HIGH (the live mechanism behind the tower roof/edge
flap; almost certainly #123 and related flap reports)
**Status:** CLOSED 2026-06-12 — user re-gate ("Seems to have been
fixed" — ran past distant buildings, no flicker/vanish) + desk
confirmation. The bistable-admission mechanism died with the **W=0
polyClipFinish clip port** (`987313a`, the #119/#120 work that
"kills the knife-edge class everywhere") plus the #120 containment-
rejection growth fix. NOTE the captured-pair evidence in
`tower-viewer-capture.log` predates all of those fixes — it was the
near-eye knife edge, the same class. Pins (both green at HEAD):
`Issue127FloodFlipReplayTests.CapturedFlipPair_AdmissionIsStable`
(the original 4 cm flip pair now |A|=|B|, zero diff, all FOVs, both
pre-gate states) + `DistantBuildingStrafe_NoAdmissionChurn` (the
regression pin: 0 churn across 21 building groups × {10,30,60,120,190} m
× 100 mm-steps run-past strafe, both pre-gate states). DO-NOT-RETRY:
do not re-open the BuildFromExterior seed gates for flap symptoms
without a FRESH repro at HEAD — the captured-pair lead is dead.
**Filed:** 2026-06-11 (tower capture run)
**Component:** render — BuildFromExterior seed admission / per-building
flood stability