research: Floating Islands planned around fixed tunnels (L140, 0/16; kept as patch)

Native FI binds and its own route/clearance/mouth-support checks pass on seeds 0 and 10, but 14/16 seeds have no
island arrangement that clears the fixed passage tubes and reaches both mouth heights; seed 10 has one composed
collision; ripple 6-7 cm vs the 3.5 cm limit on both upper passages. Third failure of the 'islands adapt to fixed
tunnels' premise (L133 x2, L140).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016dhxM43dnWvUu2B5Ph1iG1

Standalone/Research/WorldAssemblerM3/Linux140/REPORT.md

@@ -0,0 +1,34 @@
+# L140 — Floating Islands planned around passages
+
+**Not accepted: 0/16 composed seeds passed.** The new Core recipe reaches native S1 dispatch and meets its dedicated route, passage-clearance, and mouth-support checks on seeds 0 and 10. Seed 10 still has one blocked capsule in the composed owner route; both seeds fail the unchanged passage-ripple gate. Fourteen seeds cannot produce a corridor-aware plan.
+
+## Change
+
+Core evaluator version is 239 and Floating Islands geometry version is 10. The owner adapter resolves the fixed passage layout first, then plans nine native islands and a walk route around the 0–1 arrival and 1–2 departure tubes. The plan records route and island anchors in the resolved layout. The clearance check reserves the 1.053 m passage influence reach plus the 0.880 m capsule half-height and checks five support probes at each mouth. Shape composition preserves native landing support and passage shell distance for this recipe. Direct legacy recipe fixtures retain their earlier attach-before-layout order.
+
+S1 binds to `FloatingIslands-native` in the explicit Core owner mode. `bUseVoxelForgeCore` remains opt-in; the fast-tier default owner pose still reports the legacy analytic S1 path.
+
+## Composed sweep
+
+The final-source Clang run covered seeds 0–15. Results and per-seed logs are in [`summary.json`](../../../../Saved/Linux/l140/seeds/summary.json) and `Saved/Linux/l140/seeds/` (source stamp `6205e6c180ef32c41792dc3e0d8bf443a96df41974f40334af4bf3a157ab88da`).
+
+- **Seed 0:** the planner tried 11 detours; its 94.5 m route has 1.47 m conservative tube clearance. Native route audit: 128 points, 0 blocked capsule samples, 0 unsupported points, 0 grade failures. Passage check: 5,325 tube samples, 0 island conflicts, 676,275 route checks, 0 route conflicts, arrival and departure support 5/5, 2.824 m minimum excess clearance. The composed S1 route and seams pass. Ripple is 1/3: wall ripple is 6.85 cm on 0–1 and 7.10 cm on 1–2 against the unchanged 3.50 cm limit.
+- **Seed 10:** the native route and passage checks pass, with 5/5 mouth support and 0 isolated route conflicts. The composed S1 capsule audit finds one blocked sample at `(-6.246, -28.615, -737.982) m`, inside the resolved 0–1 passage; composed density is `-0.002062` while native island density is `+1.730469`. Ripple is again 1/3 (6.22 cm on 0–1 and 7.19 cm on 1–2). Seams and negative controls pass.
+- **Seeds 1, 2, 7, 8, 9, 12, 13, 15:** no candidate clears the tubes; best conservative clearances range from −5.994 m to −0.406 m. **Seeds 3, 5, 6, 14:** candidates clear the tubes but the supported island profile cannot reach both fixed mouth heights. **Seeds 4 and 11:** candidate islands escape the sealed vertical layout.
+
+The dedicated gate is therefore 0/16. No geometry variant was attempted after these results. The repeated 0–1/1–2 ripple failure is also consistent with L67's closed authored-radius experiment: it measured 7.27 cm on 1–2 against the same 3.50 cm limit ([L67 report](../../Linux67/REPORT.md)).
+
+## Other checks
+
+- **Fast tier:** PASS, 287.8 s; negative controls and existing worker-hash checks passed. It continues to verify the default legacy S1 dispatch.
+- **Determinism:** PASS, six runs (Clang/GCC × W1/W8/W12). All produced the same 512-tile density, mesh, payload, topology, material, and exact-query hashes, with layout identity `resolved-layout-v3-fnv64:08da20d55ff6820f`. Native recipe hash: `0b6a23bc73a3b867`. See the [baseline](baselines/native-owner-fi-seed0.json) and [`summary.json`](../../../../Saved/Linux/l140/determinism/summary.json).
+- **Captures:** ten before/after JPEGs passed the existing image-quality gate. The [manifest](captures/manifest.json) records eye-height arrival, island edge, route between islands, departure, and wide silhouette views for both versions. See [before](captures/before-arrival-mouth.jpg), [before edge](captures/before-island-edge.jpg), [before route](captures/before-walk-between-islands.jpg), [before departure](captures/before-departure-mouth.jpg), [before wide](captures/before-wide-silhouette.jpg); [after](captures/after-arrival-mouth.jpg), [after edge](captures/after-island-edge.jpg), [after route](captures/after-walk-between-islands.jpg), [after departure](captures/after-departure-mouth.jpg), [after wide](captures/after-wide-silhouette.jpg).
+- **Linux VFHostEditor:** PASS in 73.58 s. Build log: [`ubt.log`](../../../../Saved/Linux/l140/ubt.log).
+- **L80 timing:** not completed. The machine gate passed (load 0.97, 2-second CPU idle 98.5%), but the candidate warm-up could not construct native S1 around the checked-in Unreal-exported passage layout: 0 detours, best clearance −3.509 m. No measured L80 pairs were recorded; the ±1% A/A floor remains the L137 reference. A separate 30-second setup probe with a regenerated seed-0 owner plan timed out during passage-route planning, so I did not run a mismatched or incomplete timing matrix.
+- `git diff --check`: PASS.
+
+## Remaining issues
+
+The fixed exported owner layout and many generated seeds leave no route-clear island arrangement. On seed 10, the native-only clearance check also misses a collision that the final composed owner route catches. Ripple remains above the existing limit on both upper passages. Native S1 is still opt-in and is not promoted by this round.
+
+Changed Unreal source: [`VoxelForgeCoreAdapter.cpp`](../../../../Source/VoxelForge/Private/VoxelForgeCoreAdapter.cpp). Windows compilation remains for the owner.