Reorganize Blender Web execution around capabilities

docs/status/C4-001.md

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+# C4-001 Status
+
+status: done
+task: modifier_positive_pilot
+gate: G4
+updated: 2026-08-23 America/New_York
+
+C4-001 implements a typed `modifierSetEnabled` command for the `MODIFIER`
+target. The command validates its two-field payload, resolves the modifier
+before mutation, and uses the shared atomic Main transaction so malformed,
+stale, wrong-target, and unknown-modifier cases preserve revision and dirty
+state.
+
+The focused Node test and Chromium-only pilot cover desktop/WASM delta parity,
+dirty state, negative rollback, undo/redo, save, and reopen. Deterministic
+receipts and C3-002 regression are recorded under
+`tests/golden/corrective/C4-001/`; legacy queue mutation remains forbidden.
+
+All focused, Chromium, deterministic, regression, typecheck, governance,
+protected-hash, and diff gates exited 0. Handoff manifest:
+`tests/golden/corrective/C4-001/manifest.json`. Next corrective task:
+`C4-002`.