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wip(assembler): round L13 -- one density field for every route (multiplayer determinism fix)

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Region pages fell back to the legacy GetDensityAt evaluator while the base shape used the Core
manifest field, so a tile's density (and sometimes mesh) depended on streaming history. Pages
are now bound to their world's base FStandaloneShapeWorld evaluator before publication; density,
lattice, detail, classification and solid queries all delegate to it. WorldAssemblyEvaluatorVersion
5 -> 6. Route-parity audit: fails on L12 (5/5); after the fix 0 mismatches over 87 tile pairs
(base/page, base/native-only, edited, two histories), 56 exact-query pairs, 2.3M page samples,
4 seeds/recipes. Page-tile proof audit: 1,274 blocks, 0 violations. The spawn and island worlds
are unchanged; crossing output changed as intended. Reviewer interleaved spawn: +1.1% (noise).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CSFYgsdW8ejZSyiMf4qRSX
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Fr0zkaandClaude Opus 5.5 committed 2026-10-20 01:54:54 +02:00
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@@ -1128,6 +1128,15 @@ Mixed/Unknown remains on the fill path. The headless `--audit-uniform-block-proo
verification, while `--profile-lod-work` reports per-LOD filled samples; both are off by default.
Implementation and evidence: [`Standalone/Research/WorldAssemblerM3/Linux9/REPORT.md`](Standalone/Research/WorldAssemblerM3/Linux9/REPORT.md).
### 3.22 Route-invariant Core density — World Assembler M3 Linux13
| Symbol | Canonical file | Role |
|---|---|---|
| `FStandaloneShapeWorld::SetSharedDensitySource`, `SharedDensitySource` | `Standalone/Core/src/ShapeWorldInternal.h`, bound before publication in `Standalone/Core/src/VoxelForgeCore.cpp` | Makes compiled analytic pages delegate field, lattice, detail, classification, and solid queries to the Core world's base shape; `WorldAssemblyEvaluatorVersion` is 6. |
The base manifest field is authoritative for tile generation and exact queries. See ARCHITECTURE
§8.36 and [`Standalone/Research/WorldAssemblerM3/Linux13/REPORT.md`](Standalone/Research/WorldAssemblerM3/Linux13/REPORT.md).
## 4. The density pipeline (most-edited hot path)
### 4.1 `GetDensityWithParams` (TunnelNetwork) — VoxelGenerator.cpp:3749