Govern task context and advance execution pointer

docs/status/M16-GAP-00055.md

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+# M16-GAP-00055 Status
+
+status: done
+task: GREASE_PENCIL_LENGTH modifier LOCAL_EXACT slice
+updated: 2026-08-20 America/New_York
+
+scope: Grease Pencil LENGTH modifier stack exposure for `object:GreasePencilObject`.
+
+evidence:
+
+- Desktop fixture exposes `Gp Length`; save/reopen is exact.
+- WASM/Main exposes `GREASE_PENCIL_LENGTH` on the object scene node; save/reopen is exact.
+- Malformed Blend input is rejected without mutating Main.
+- Generator, npm comparator, and direct comparator exited 0.
+
+knownRisk: Grease Pencil length evaluation remains blocked; this slice covers metadata and object-stack transport only.
+
+nextTask: `M16-GAP-00056`