Reorganize Blender Web execution around capabilities

docs/status/C2-002.md

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+# C2-002 Status
+
+status: done
+task: atomic_main_mutation
+gate: G2
+updated: 2026-08-23 America/New_York
+
+C2-002 adds an in-memory atomic Main transaction boundary. Commands mutate a
+cloned draft and publish exactly one revision/dirty update only after the
+outcome passes validation. Adapter exceptions, cancellation, malformed
+outcomes, and stale revisions restore the original value, revision, and dirty
+state before the shared runner normalizes the failure result.
+
+The focused transaction test passed 5/5 assertions. Desktop and WASM positive
+receipts matched with revision 4 -> 5; cancellation, malformed outcome, and
+revision conflict all preserved revision 4 and the clean snapshot. Receipt
+determinism, protected legacy hashes, typecheck, context/corrective governance,
+task-context, and `git diff --check` all exited 0.
+
+Evidence and manifest: `tests/golden/corrective/C2-002/`.
+Next corrective task: `C2-003`.