Complete Lattice modifier gap

docs/status/M16-GAP-00075.md

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+# M16-GAP-00075 Status
+
+status: done
+task: LATTICE modifier LOCAL_EXACT slice
+updated: 2026-08-20 America/New_York
+
+scope: Mesh LATTICE modifier stack exposure for `object:WebGapLatticeModifierObject`.
+
+evidence:
+
+- Desktop fixture exposes `WebGapLatticeModifier`; save/reopen is exact.
+- WASM/Main exposes LATTICE type code 2 and metadata parameters on the mesh scene node.
+- Malformed Blend input is rejected without mutating Main.
+- Generator and npm comparator exited 0.
+
+knownRisk: Lattice deformation evaluation remains metadata-only; this slice covers modifier stack transport and metadata.
+
+nextTask: `M16-GAP-00076`