Govern task context and advance execution pointer

docs/status/M16-GAP-00014.md

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+# M16-GAP-00014 Status
+
+status: done
+task: Mesh data-block LOCAL_EXACT slice
+updated: 2026-08-19 America/New_York
+
+scope: Blender 5.2 Mesh geometry metadata for one quad: counts, triangulated indices, positions, UV layer identity and UV values.
+
+evidence:
+
+- `tools/web/generated/M16-GAP-00014.py` generated a retained `WebGapMesh` quad with four vertices, one face and one `WebGapUV` layer.
+- Desktop report reopened after save and matched exactly: 4 vertices, 4 edges, 1 face, 4 corners, 2 triangles, deterministic positions/indices and UV values.
+- WASM/Main opened the same fixture with `geometryStatus=available`, matched counts, positions, indices and UV layer, and save/reopen matched the complete mesh snapshot exactly.
+- A truncated malformed Blend submitted to an already loaded Main was rejected and the original snapshot remained unchanged.
+- `build_blender_5.2.0/bin/blender -b --factory-startup --python tools/web/generated/M16-GAP-00014.py -- tests/files/web/generated/M16-GAP-00014-datablock-Mesh.blend` exited 0.
+- `npm --prefix web run test:generated-gap -- --task M16-GAP-00014` exited 0.
+- `node tools/web/check-generated-gap.mjs --task M16-GAP-00014` exited 0.
+
+artifacts: `tests/golden/M16-GAP-00014/manifest.json` contains SHA-256 for the parent manifest, fixture, generator, desktop/Web checkers, reader/protocol/runtime and both reports.
+
+knownRisk: This closes one `datablock:Mesh` geometry-reader slice only. Mesh edit operators, modifiers, shape keys, skinning, paint attributes and all other generated gaps remain separate tasks.
+
+rollback: remove this task's fixture, checker, reports, manifest, status and context; restore `M16-GAP-00013` as the queue tail without editing its successful evidence.
+
+nextTask: `M16-GAP-00015`