feat(editor): walk a composed candidate in PIE + why rooms read angular

PART B -- the thing Jahni asked for: "any way to test those in game?"
A candidate existed only as measurements and PNGs. Now he can stand in one.

  Select the VoxelWorld actor in PIE -> Live Edit|Composer ->
  ComposerSeed / ComposerCandidateIndex / ComposerTargetStrateIndex /
  bComposerRollStructure -> click Apply Composer Candidate.

The button and the automation tests call the SAME roll wrapper, which was
the load-bearing requirement: a second roll path could drift, and then he
would be judging a different world than the contact sheet describes. A
determinism sample is logged on apply (seed, index, recipe, archetype,
metrics, epoch, eight-point density verdict) so drift is caught the day it
happens rather than in a month.

Hazards handled, since this is the first composer code to touch the live
runtime path: preflight materialisation before any live mutation, generation
and decoration tasks drained, PassagesVersion bumped to invalidate
thread_local caches, reuse of the existing RegenerateAllChunks / Epoch
invalidation rather than a new path, no Initialize() or GeneratePassages()
during apply (the re-entrancy trap), DiffLayer locks untouched, and custom
recipes conservatively force ClassifyTile to Mixed.

Scope is deliberate: a DENSITY-ONLY overlay. Layout height, authored
passages, content, water and biome metadata stay from the existing slot;
RebuildStrates() clears it. A full composed layout replacement needs a safe
rebuild path that does not exist yet.

Editor-only, verified: a Shipping build succeeds with the bridge excluded
(96/96 actions), so §3.1's "offline only, never on a player's machine"
still holds.

⚠️ UNVERIFIED BY DESIGN: a button cannot be tested headlessly and Codex was
told not to claim it works. Jahni presses it and confirms the visual plus
the "determinism=PASS" log line.

PART A -- why rooms read angular, measured not guessed. One of three room
shapes is VoxelSDF::RoundedBox:
  ShapeA = (.8 Rxy, .8 Rxy, .8 Rz)   ShapeR = .25 Rxy
so rounding is 31% of the horizontal half-extent but 78% of the vertical.
Corners are rounded; the broad planar FACES survive. SmoothMin (blend 4)
softens room/tunnel junctions not isolated corners; the cave warp bends
geometry but preserves flat regions; roughness is surface-scale only.
The name is accurate -- "rounded box" is not "blob".

NOT ACTED ON. Jahni corrected his own read: the angular archetype is Maze
(lattice source, rectilinear BY DESIGN and correct), and TunnelNetwork is
"alright-ish". Codex's recommendation is recorded for if he ever wants it:
~5-10% boxes, 10-20% capsules, rest ellipsoids, or a larger ShapeR.

Also closed REVIEW_FINDINGS EVoxelPassageType/Style as WONTFIX, enacting a
2026-08-16 judgement that recommended closure and was left open.

Build clean (Editor + Shipping), 25 succeeded / 0 failed, run by me.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01VJiTcTSDNkKBtnNdiBtdaU

REVIEW_FINDINGS.md

@@ -90,7 +90,10 @@ Legend: ✅ verified against code · ◻️ checklist box.
   like Box/Capsule already did (one diff-layer + remesh dispatch). *(2026-07-04)*
 - [x] **`VoxelContentManager.cpp`** — duplicated drain/reset loops → `DrainDecoResults()` +
   `ResetGridBuildState(FDecoGrid&)`. *(2026-07-04)*
-- [ ] **`EVoxelPassageType` vs `EVoxelPassageStyle`** — two overlapping passage-shape enums, both in
+- [x] **`EVoxelPassageType` vs `EVoxelPassageStyle`** — ✅ **CLOSED 2026-09-04 as WONTFIX**, enacting
+  the 2026-08-16 judgement below, which recommended closure and was then left open by oversight. No
+  code change; the two enums stay.
+  Two overlapping passage-shape enums, both in
   active use (11 refs). Consider consolidating to one. *(judgment call, not dead)*
   **JUDGED 2026-08-16 — LEAVE THEM. Recommendation: close this item rather than act on it.** They
   read as duplicates from the index and are not: `EVoxelPassageType` (`VoxelStrateTypes.h` ~42) is