Advance M16 modifier parity and context governance

docs/status/M16-GAP-00093.md

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+# M16-GAP-00093 Status
+
+status: done
+task: SKIN modifier LOCAL_EXACT slice
+updated: 2026-08-20 America/New_York
+
+scope: Mesh SKIN modifier stack exposure for `mesh:WebGapSkinMesh`.
+
+evidence:
+
+- Desktop fixture exposes `WebGapSkin` as SKIN type code 42; save/reopen is exact.
+- WASM/Main exposes SKIN type code 42 as `METADATA_ONLY`, including branch smoothing, skin flags, and symmetry axes; save/reopen is exact.
+- Malformed Blend input is rejected without mutating Main.
+- Generator, npm comparator, and direct comparator exited 0.
+
+knownRisk: Skin geometry evaluation remains metadata-only; this slice covers modifier stack transport and stable modifier metadata.
+
+nextTask: `M16-GAP-00094`