Govern task context and advance execution pointer

docs/status/M16-GAP-00010.md

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+# M16-GAP-00010 Status
+
+status: done
+task: Lattice data-block LOCAL_EXACT slice
+updated: 2026-08-19 America/New_York
+
+scope: Blender 5.2 Lattice data-block dimensions, interpolation, outside flag, vertex group, point deformation, weight and selection.
+
+evidence:
+
+- Desktop fixture generated by `tools/web/generated/M16-GAP-00010.py`; Blender 5.2 opened, saved to a fresh file, reopened in a new process and matched exactly.
+- WASM/Main opened the same fixture, produced 3x2x2 / 12-point `lattice:WebGapLattice`, and matched the desktop point report exactly.
+- WASM save/reopen snapshot matched the pre-save snapshot exactly.
+- `node tools/web/check-generated-gap.mjs --task M16-GAP-00010` exited 0.
+- `cmake --build build_web_blender6 --target web_engine -- -j2` exited 0 after `source tools/web/emscripten-env.sh`; generated runtime assets were installed and hash-bound.
+
+artifacts: `tests/golden/M16-GAP-00010/manifest.json` contains SHA-256 for the parent manifest, fixture, generator, desktop checker, Web checker, reader, protocol, WASM/JS runtime and both reports.
+
+knownRisk: This closes one `datablock:Lattice` slice only. Lattice edit operators, lattice modifier evaluation, shape keys, vertex-group weights and all other 6,890 generated gaps remain separate tasks and are not implied complete.
+
+rollback: remove this task's fixture, checker, reports, manifest and runtime/protocol changes; restore parent `M16-GAP-00009` as the queue tail without editing its successful evidence.
+
+nextTask: `M16-GAP-00011`