06f558dc9164964b9ebe0d626f1357e8b550b81f
Tiles with passage-overlap score >= 9 split grid fill over up to 4 helper lanes (disjoint rows, same per-sample order, join before MC) when workers are idle. FI junction tile fill 173 -> 99 ms; estimated serial floor ~0.55-0.60 s. Readiness essentially unchanged (FI/TN LOD0-2 ~2.15 s @W12): the limit is now aggregate work, not single tiles. Unreal: LOD0-2 ordered by passage overlap before travel/distance (L80 modes kept); far parents built after LOD0-1, LOD2 gated on them; helper budget via ParallelFor. Unreal null-RHI FI arrival: LOD0-2 resident at 3.65 s. All tile hashes identical to L84 (four whole views). Fast tier PASS; Linux UE host builds. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_016dhxM43dnWvUu2B5Ph1iG1
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