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diag(render/physics): flap root-caused to physics rest µm-jitter; refute prior diagnoses

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Apparatus + handoff for the indoor flap. Confirmed (primary evidence): the flap is the
portal-flood clip being µm-sensitive at the threshold, driven by a ~1-8µm jitter in the
player RenderPosition (physics resting position not bit-stable; Lerp surfaces it). REFUTES
the 2026-06-07 see-through/EnvCell/outdoor-node diagnosis (ModelId GfxObj 0x01000A2B IS the
solid exterior) AND an enqueue-once attempt (retail propagates late slices via AddToCell;
the existing PropagatesNewSlicesToExit test caught it; reverted). Adds: Build determinism
test, A8CellAudit gfxobj dump, [pv-input] 6dp probe + [render-sig] outRoot/bshell fields.
No functional fix shipped. Next: higher-precision physics rest trace -> port retail
kill_velocity/contact rest-stability. Canonical: docs/research/2026-06-08-flap-rootcause-physics-rest-handoff.md

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Erik 2026-06-08 09:16:12 +02:00
parent d0b65c4170
commit d6aa526dd3
6 changed files with 300 additions and 1 deletions
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7
docs/superpowers/specs/2026-06-08-portal-flood-membership-stability-design.md
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@ -2,7 +2,12 @@
**Date:** 2026-06-08
**Branch:** `claude/thirsty-goldberg-51bb9b`
**Status:** design approved (user, 2026-06-08); TDD implementation pending behind a visual gate.
**Status:** ⚠️ **§4 (enqueue-once) REFUTED 2026-06-08** — retail propagates late slices via `AddToCell`
(decomp :433494); the existing `Build_ViewGrowthAfterDoneCell_PropagatesNewSlicesToExit` test encodes
that and enqueue-once broke it (reverted). The flap's confirmed root is the **physics resting position
µm-jitter** (§6 contingency, now the active direction). **CANONICAL PICKUP:**
`docs/research/2026-06-08-flap-rootcause-physics-rest-handoff.md`. Keep §1–§3 (mechanism + retail
grounding) as accurate diagnosis; treat §4–§5 as a refuted approach.
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