Govern task context and advance execution pointer

docs/status/M16-GAP-00036.md

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+# M16-GAP-00036 Status
+
+status: done
+task: CLOTH modifier LOCAL_EXACT slice
+updated: 2026-08-20 America/New_York
+
+scope: CLOTH modifier identity and visibility modes for `mesh:WebGapClothMesh`.
+
+evidence:
+
+- Desktop fixture exposes `WebGapCloth`; save/reopen is exact.
+- WASM/Main exposes the same modifier stack from the same fixture; save/reopen is exact.
+- Malformed Blend input is rejected without mutating Main.
+- `npm --prefix web run test:generated-gap -- --task M16-GAP-00036` and `node tools/web/check-generated-gap.mjs --task M16-GAP-00036` exited 0.
+
+knownRisk: Full evaluated cloth simulation and editor mutation remain outside this metadata/local-exact modifier slice.
+
+nextTask: `M16-GAP-00037`