docs(phase): Indoor walking Phase 2 — Portal-based cell tracking shipped

Closes ISSUES.md #87 + #85 + the remaining wall-pass-through portion of
#84 (fully closes #84). Portal-graph cell traversal replaces Phase D's
AABB containment. Walking through doors promotes/demotes CellId correctly
via portal traversal; walls block from inside indoor cells; indoor walkable
plane is synthesized from the cell's floor poly so the resolver tracks
walkability correctly during indoor movement.

Files two new issues: #88 (indoor static objects vibrate — pre-existing,
spotted during Phase 2 testing) and #89 (BSPQuery.SphereIntersectsCellBsp
— follow-up to make CheckBuildingTransit retail-faithful; currently uses
radius-less PointInsideCellBsp as a documented approximation).

ISSUES.md: #87, #85, #84 moved to DONE. #88 + #89 filed.
Roadmap: Indoor walking Phase 2 added to shipped table.
CLAUDE.md: recent-phase paragraph updated to reflect Phase 2 shipped.
New handoff: docs/research/2026-05-19-indoor-walking-phase2-shipped-handoff.md

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

docs/plans/2026-04-11-roadmap.md

@@ -72,6 +72,7 @@
 | Indoor lighting + rendering — Phase 2 (fix) | Three-component diagnostic-driven fix for missing-floor bug. Component 1: `WbMeshAdapter` captures the `Task<ObjectMeshData?>` from `PrepareMeshDataAsync` and attaches a `ContinueWith` for EnvCell ids — surfaces faulted-task exceptions + clean-null returns. Component 2: replaced `NullLogger<ObjectMeshManager>` with a Console-backed `ConsoleErrorLogger<T>` so WB's intentional `_logger.LogError(ex, ...)` at the swallow site at `ObjectMeshManager.cs:589` writes `[wb-error]` lines. **Root cause definitively identified in one capture: `ArgumentOutOfRangeException` from `DatReaderWriter.Setup.Unpack` at WB's `PrepareEnvCellMeshData` line 1223 — `TryGet<Setup>(stab.Id, ...)` was called blindly on every `envCell.StaticObjects` id without checking the Setup-prefix bit. GfxObj-typed stabs (0x01xxxxxx) caused mid-deserialization throws, bubbling up to PrepareMeshData's outer catch which silently returned null. Entire cell upload failed, room mesh never reached `_renderData`.** Component 3 fix: one-line type-check guard `(stab.Id & 0xFF000000u) == 0x02000000u && _dats.Portal.TryGet<Setup>(stab.Id, out var stabSetup)`. Committed to WB submodule on branch `acdream-fix-floor-rendering` at SHA `34460c4` — needs submodule pointer advance at merge time. **Verification: 0 [wb-error] (was 385), 0 NULL_RESULT (was 55), Holtburg 123/123 cells complete (was 97/123). User visually confirmed floors render in Holtburg Inn.** Surfaced 9 pre-existing indoor bugs (see-through floor, indoor collision, stairs, walls, click-thru, indoor lighting artifacts, atmospheric-lighting-on-stabs, slope terrain lighting) — all filed in `docs/ISSUES.md` for follow-up phases. Cause report: [`docs/research/2026-05-19-indoor-cell-rendering-cause.md`](../research/2026-05-19-indoor-cell-rendering-cause.md). Verification: [`docs/research/2026-05-19-indoor-cell-rendering-verification.md`](../research/2026-05-19-indoor-cell-rendering-verification.md). Plan: [`docs/superpowers/plans/2026-05-19-phase2-indoor-cell-rendering-fix.md`](../superpowers/plans/2026-05-19-phase2-indoor-cell-rendering-fix.md). | Live ✓ |
 | C.1.5b | Per-part PES transforms + dat-hydrated entity DefaultScript dispatch. Closes issue #56. Shipped 2026-05-12 across 5 commits (`1e3c33b` docs+plan, `f3bc15e` SetupPartTransforms helper, `11521f4` ParticleHookSink applies `CreateParticleHook.PartIndex`, `5ca5827` activator refactor + GameWindow resolver lambda, `8735c39` GpuWorldState 4 new fire-sites). **Slice A** — new [`SetupPartTransforms.Compute(setup)`](../../src/AcDream.Core/Meshing/SetupPartTransforms.cs) walks `PlacementFrames[Resting]` → `[Default]` → first-available (mirrors `SetupMesh.Flatten` priority) and returns `Matrix4x4` per part; new `ParticleHookSink.SetEntityPartTransforms(entityId, partTransforms)` mirrors the existing `_rotationByEntity` pattern; `SpawnFromHook` now transforms hook offset through `partTransforms[partIndex]` before applying entity rotation. **Slice B** — activator's `ServerGuid==0` guard relaxed: keys by `entity.ServerGuid` when non-zero, else `entity.Id` (collision-free with server guids in the `0x40xxxxxx` interior / `0x80xxxxxx` scenery / `0xC0xxxxxx` ranges). Resolver delegate refactored to return `ScriptActivationInfo(ScriptId, PartTransforms)` so one dat lookup yields both pieces. `GpuWorldState` fires the activator from 4 new sites: `AddLandblock` + `AddEntitiesToExistingLandblock` (Far→Near promotion) for OnCreate, `RemoveLandblock` + `RemoveEntitiesFromLandblock` (Near→Far demotion) for OnRemove. ServerGuid==0 filter on AddLandblock avoids double-firing pending-bucket merges. **Reality discovery folded into spec §3**: EnvCell `StaticObjects` are already hydrated as `WorldEntity` instances by `GameWindow.BuildInteriorEntitiesForStreaming` (with stable `entity.Id` in `0x40xxxxxx`) — no synthetic-ID scheme or separate walker class needed (handoff §4 Q1/Q2 mooted). **Visual verification 2026-05-12**: Holtburg Town network portal swirl distributes across the arch (no ground-burial), Inn fireplace flames render over the firebox, cottage chimney smoke columns render, spell-cast animation-hook particles all match retail. 18 new + 4 updated tests, all Vfx/Meshing/Streaming/Activator green. Spec: [`docs/superpowers/specs/2026-05-13-phase-c1.5b-design.md`](../superpowers/specs/2026-05-13-phase-c1.5b-design.md). Plan: [`docs/superpowers/plans/2026-05-13-phase-c1.5b.md`](../superpowers/plans/2026-05-13-phase-c1.5b.md). | Live ✓ |
 | Indoor walking Phase 1 — BSP cluster (partial) | 2026-05-19. Probe + WorldPicker cell-BSP occlusion (#86 closed) + CellId promotion via AABB containment (partial #84 fix). Seven commits across 5 phases: `18a2e28` plan, `27d7de1` Phase A `[indoor-bsp]` probe + toggle, `3764867` Phase B CellBspRayOccluder in WorldPicker, `4e308d5` Phase B screen-rect tests, `c19d6fb` Phase D AABB containment + L.2e bare-low-byte fix, `fda6af7` Phase E `[cell-cache]` diagnostic, `1f11ba9` Phase E extended AABB/bsphere/poly-count fields. **#86 closed** (picker occlusion). **#84 partially closed** (spawn-in-building stuck-above-floor resolved; threshold/doorway walls remain open under #87). **#85 open** (wall pass-through root cause confirmed as same as #84 remaining symptom — CellId doesn't stay promoted during outdoor→indoor walking). **#87 filed** (portal-based indoor cell tracking — retail-faithful follow-up). `[indoor-bsp]` + `[cell-cache]` probes stay in place as scaffolding for the follow-up phase. Handoff: [`docs/research/2026-05-19-cluster-a-shipped-handoff.md`](../research/2026-05-19-cluster-a-shipped-handoff.md). Plan: [`docs/superpowers/plans/2026-05-19-indoor-walking-phase1-bsp-cluster.md`](../superpowers/plans/2026-05-19-indoor-walking-phase1-bsp-cluster.md). | Tests ✓ |
+| Indoor walking Phase 2 — Portal-based cell tracking | 2026-05-19. Portal-graph traversal replaces Phase D's AABB containment. Six commits: `1969c55` CellBSP+Portals wired into CellPhysics; `aad6976` CellTransit.FindCellList + FindTransitCellsSphere + AddAllOutsideCells + ResolveCellId rename; `069534a` BuildingPhysics + CheckBuildingTransit for outdoor→indoor entry; `702b30a` code-review polish; `3ffe1e4` pass foot-sphere center to ResolveCellId (critical fix — was passing CheckPos instead of GlobalSphere[0].Origin, causing PointInsideCellBsp to return false at floor level); `eb0f772` TryFindIndoorWalkablePlane synthesizes walkable plane from cell floor poly so the resolver doesn't fall through to outdoor SampleTerrainWalkable. **Closes #87, #85, and the wall-pass-through portion of #84 (fully closes #84).** Files #88 (indoor static object vibration — pre-existing) and #89 (BSPQuery.SphereIntersectsCellBsp — approximation in CheckBuildingTransit). `[cell-transit]`, `[indoor-bsp]`, `[check-bldg]`, `[cell-cache]` probes stay in place. Handoff: [`docs/research/2026-05-19-indoor-walking-phase2-shipped-handoff.md`](../research/2026-05-19-indoor-walking-phase2-shipped-handoff.md). | Live ✓ |
 
 Plus polish that doesn't get its own phase number:
 - FlyCamera default speed lowered + Shift-to-boost