Reorganize Blender Web execution around capabilities

docs/status/C4-003.md

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+# C4-003 Status
+
+status: done
+task: pilot_negative_matrix
+gate: G4
+updated: 2026-08-23 America/New_York
+
+C4-003 runs a shared negative matrix over the completed Asset Catalog,
+Modifier, and Mesh pilots. It covers malformed payloads, unsupported targets,
+stale revisions, and missing external resources; every result is normalized to
+a closed failure code and all three Main snapshots remain unchanged.
+
+The Node matrix and Chromium-only pilot are deterministic and include the
+focused family regressions. Evidence is under
+`tests/golden/corrective/C4-003/`; legacy queue mutation remains forbidden.
+
+All focused, Chromium, deterministic, regression, typecheck, governance,
+protected-hash, and diff gates exited 0. Handoff manifest:
+`tests/golden/corrective/C4-003/manifest.json`. Next corrective task:
+`C5-001`.