Govern task context and advance execution pointer

docs/tasks/M16-GAP-00001.md

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+# M16-GAP-00001：Action data-block LOCAL_EXACT slice
+
+- `task`: `M16-GAP-00001`
+- `parent`: `M15-03E`
+- `status`: `in_progress`
+- `gap`: `datablock:Action`
+- `ownerFamily`: `RNA_DATABLOCK`
+- `targetImplementationClass`: `LOCAL_EXACT`
+
+## Required evidence
+
+- Fixture: `tests/files/web/generated/M16-GAP-00001-datablock-Action.blend`
+- Desktop command: `build_blender_5.2.0/bin/blender -b --factory-startup --python tools/web/generated/M16-GAP-00001.py -- tests/files/web/generated/M16-GAP-00001-datablock-Action.blend`
+- Web command: `npm --prefix web run test:generated-gap -- --task M16-GAP-00001`
+- Comparator: `node tools/web/check-generated-gap.mjs --task M16-GAP-00001`
+
+The task cannot be marked complete until desktop/WASM same-fixture evidence, save/reopen Main evidence,
+artifact hashes and the comparator result are present.