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wip(assembler): round L33 -- SurfaceWorld can be an upper strate; FloorProfileBlend measures seams

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Route planning for an upper SurfaceWorld failed on long candidate chords over steep relief; chords
are now capped to the arrival/departure radii on an 8 m centre grid with an origin-proximity cost
(21.5 m walk, about 4 deg). The departure passage starts at the SW ground and tunnels down through rock.
FI -> SW -> TN fixture: all 4 styles pass every passage audit on both compilers. FloorProfileBlend
now checks endpoint height/tangent seams (step and tangent-step negative controls detected). Owner
world hashes unchanged; 30/30 determinism; cost within 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 2026-10-21 22:30:36 +02:00
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@@ -1229,6 +1229,20 @@ The Unreal adapter now forwards the authored transition type and chunk width; th
were not compiled here. See ARCHITECTURE §8.46 and
[`Standalone/Research/WorldAssemblerM3/Linux29/REPORT.md`](Standalone/Research/WorldAssemblerM3/Linux29/REPORT.md).
### 3.30 SurfaceWorld as an upper strate and floor-profile joins — World Assembler L33
| Symbol | Canonical file | Role |
|---|---|---|
| `BuildFiniteStrateRoute` | `Standalone/Source/WorldAssemblyPrototype.h` | Samples route heights from the composed terrain ground; bounds candidate chords by the arrival/departure placement radii and records per-segment grade failures. |
| `PlanResolvedLayoutPassagesV1` | `Standalone/Core/src/ResolvedLayoutInternal.h` | Starts an upper-SurfaceWorld departure at its terrain mouth, opens a small portal and smoothsteps to the rock tunnel while orienting the ring outward. |
| `BuildPassageVoidCrossingPlan`, `PassageBridgeSignedDistance` | `Standalone/Core/src/ShapeWorldInternal.h` | Sizes unsupported ranges from the full control-segment window only for upper SurfaceWorld; other upper generators keep the previous bracketing-sample bounds. |
| `--audit-resolved-layout-passages` | `Standalone/Source/StreamBenchmarkPipeline.h` | Uses floor height rather than bore-centre height for naturalness and records failed-only wall probes for column audits. |
| `FloorProfileBlend` | `Standalone/Core/src/ShapeWorldInternal.h` | Measures endpoint height/tangent continuity; chord deviation is informational, with step and tangent-step negative controls. |
The owner SurfaceWorld hashes match L32 and evaluator/recipe versions are unchanged. See
ARCHITECTURE §8.47 and
[`Standalone/Research/WorldAssemblerM3/Linux33/REPORT.md`](Standalone/Research/WorldAssemblerM3/Linux33/REPORT.md).
## 4. The density pipeline (most-edited hot path)
### 4.1 `GetDensityWithParams` (TunnelNetwork) — VoxelGenerator.cpp:3749