Govern task context and advance execution pointer

docs/status/M16-GAP-00029.md

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+# M16-GAP-00029 Status
+
+status: done
+task: World data-block LOCAL_EXACT slice
+updated: 2026-08-20 America/New_York
+
+scope: World identity, background color and bounded mist settings for `world:WebGapWorld`.
+
+evidence:
+
+- Desktop fixture exposes `WebGapWorld` with the configured color and mist fields; save/reopen is exact.
+- WASM/Main exposes the same world resource from the same fixture, save/reopen is exact, and malformed Blend input leaves Main unchanged.
+- `npm --prefix web run test:generated-gap -- --task M16-GAP-00029` and `node tools/web/check-generated-gap.mjs --task M16-GAP-00029` exited 0.
+
+knownRisk: Full world shader/editor mutation remains outside this bounded data-block identity slice.
+
+nextTask: `M16-GAP-00030`