Govern task context and advance execution pointer

docs/status/M16-GAP-00032.md

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+# M16-GAP-00032 Status
+
+status: done
+task: BEVEL modifier LOCAL_EXACT slice
+updated: 2026-08-20 America/New_York
+
+scope: BEVEL modifier identity, width, segments, profile and visibility modes for `mesh:WebGapBevelMesh`.
+
+evidence:
+
+- Desktop fixture exposes `WebGapBevel` with width 0.2, three segments and profile 0.35; save/reopen is exact.
+- WASM/Main exposes the same modifier parameters 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-00032` and `node tools/web/check-generated-gap.mjs --task M16-GAP-00032` exited 0.
+
+knownRisk: Full evaluated Bevel geometry and editor mutation remain outside this metadata/local-exact modifier slice.
+
+nextTask: `M16-GAP-00033`