Govern task context and advance execution pointer

docs/status/M16-GAP-00012.md

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+# M16-GAP-00012 Status
+
+status: done
+task: Light data-block LOCAL_EXACT slice
+updated: 2026-08-19 America/New_York
+
+scope: Blender 5.2 Area Light metadata: type, color, energy, exposure, temperature, temperature enablement, shadow flag, radius, area shape/size/spread and bounded default spot/sun fields.
+
+evidence:
+
+- `tools/web/generated/M16-GAP-00012.py` generated a single `WebGapLight` Area Light fixture with deterministic RNA values.
+- Desktop report reopened the fixture after save and matched exactly, including Light type 4, rectangle shape 1, color `[0.25, 0.5, 0.75]`, energy 400, exposure 1, temperature 5000, area size 3x2 and spread 2.4.
+- WASM/Main opened the same fixture and matched the desktop report within the bounded float tolerance. WASM save/reopen matched the full Light 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-00012.py -- tests/files/web/generated/M16-GAP-00012-datablock-Light.blend` exited 0.
+- `npm --prefix web run test:generated-gap -- --task M16-GAP-00012` exited 0.
+- `node tools/web/check-generated-gap.mjs --task M16-GAP-00012` exited 0.
+
+artifacts: `tests/golden/M16-GAP-00012/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:Light` metadata slice only. Light editing commands, rendering behavior, linked/override lights and all other generated gaps remain separate tasks.
+
+rollback: remove this task's fixture, checker, reports, manifest, status and context; restore `M16-GAP-00011` as the queue tail without editing its successful evidence.
+
+nextTask: `M16-GAP-00013`