Complete HOOK modifier gap

docs/status/M16-GAP-00072.md

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+# M16-GAP-00072 Status
+
+status: done
+task: HOOK modifier LOCAL_EXACT slice
+updated: 2026-08-20 America/New_York
+
+scope: Mesh HOOK modifier stack exposure for `object:WebGapHookObject`.
+
+evidence:
+
+- Desktop fixture exposes `WebGapHook`; save/reopen is exact.
+- WASM/Main exposes HOOK type code 9 with metadata parameters on the mesh scene node.
+- Malformed Blend input is rejected without mutating Main.
+- Generator, npm comparator, and direct comparator exited 0.
+
+knownRisk: Hook deformation evaluation remains metadata-only; this slice covers modifier stack transport and parameter metadata.
+
+nextTask: `M16-GAP-00073`