Reorganize Blender Web execution around capabilities

docs/status/M16-GAP-00279.md

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+# M16-GAP-00279 Status
+
+status: done
+task: asset.mark operator LOCAL_EXACT slice
+updated: 2026-08-24 America/New_York
+
+scope:
+
+- The minimal fixture marks `WebGapAssetMarkObject` as an asset and persists the
+  author, description, and `operator-mark` tag. Blender desktop observes the
+  missing Asset Browser/editor context as `poll=false`, records `CANCELLED` for
+  `ASSET_OT_mark`, and confirms no Main mutation. Save/reopen preserves the
+  asset metadata exactly.
+- WASM/Main reads the same object asset metadata through Scene IR with
+  `marked=true`, matching author, description, and tags. The comparator confirms
+  save/reopen stability and malformed-input rejection without Main mutation.
+
+evidence:
+
+- Fixture generation, Blender desktop checker, WASM rebuild, npm comparator,
+  direct comparator, and task-context handoff checks passed with exit code 0.
+  Chromium-only policy was preserved and no Firefox/WebKit run was made.
+- The focused reader path exports asset metadata for object IDs and the Scene IR
+  protocol declares the corresponding optional `assetData` shape; no unrelated
+  data-block, editor, browser, or native-stub behavior was changed.
+
+nextTask: `M16-GAP-00280`