Publish the exact completed walk landscape set as the typed retained particle-view product. Apply retail CLandCell membership versus constant-true non-null CEnvCell eligibility while preserving the x87 distance and AP-116 behavior.
Delete the null-root terrain visibility reconstruction and the dead drawable-cell point-light feedback chain. Retire AP-117, correct AP-85 and AD-21, and keep directional shadows, building degrade, AP-232, probes, RHI, shaders, and DAT outside this chunk.
Automated return: Release 0 warnings/0 errors; Core VFX 111/111; App particle/frame/renderer/terrain 146/146; warmed production allocation 1/1 at 0 B. First official hermetic artifact s5-c1-hermetic-20260904 is preserved at 16759/16760 with only the stale 162-row assertion; after the bounded 161 correction, exact pin 1/1 and fresh s5-c1-hermetic-corrected-20260904 16760/16760. InstalledDat 385 pass, 10 documented failures, 1 documented skip, no new identity.
Mutation 1: making EnvCell eligibility set-dependent first failed ParticleSystemTests.cs:553 Assert.True, expected true actual false. Mutation 2: making outdoor eligibility constant true first failed ParticleSystemTests.cs:559 Assert.False, expected false actual true.
Mutation 3: feeding the diagnostic union first failed WorldSceneRendererTests.cs:279 HashSet equality, expected [16842755], actual [16843008, 16842755]. Mutation 4: restoring CollectVisibleCells first failed TerrainParticleCellVisibilityTests.cs:37 and named TerrainModernRenderer.cs.
Mutation 5: restoring ObserveDrawableCells first failed TerrainParticleCellVisibilityTests.cs:37 and named WorldRenderFrameBuilder.cs. Mutation 6: changing the inclusive boundary from <= to < first failed ParticleSystemTests.cs:519 Assert.True, expected true actual false.
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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