Advance M16 modifier parity and context governance

docs/status/M16-GAP-00082.md

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+# M16-GAP-00082 Status
+
+status: done
+task: MIRROR modifier LOCAL_EXACT slice
+updated: 2026-08-20 America/New_York
+
+scope: Mesh MIRROR modifier stack exposure for `mesh:WebGapMirrorMesh`.
+
+evidence:
+
+- Desktop fixture exposes `WebGapMirror` as MIRROR type code 5; save/reopen is exact.
+- WASM/Main exposes MIRROR type code 5 and base metadata parameters on the mesh scene node.
+- Malformed Blend input is rejected without mutating Main.
+- Generator, npm comparator, and direct comparator exited 0.
+
+knownRisk: Mirror geometry evaluation remains metadata-only; this slice covers modifier stack transport and base metadata.
+
+nextTask: `M16-GAP-00083`