Advance Blender 5.2 web parity through M12-03D

docs/status/M12-01F.md

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+# M12-01F Status
+
+status: done
+task: reject duplicate IDs, catalog cycles, oversized text, and unknown fields
+updated: 2026-08-17 America/New_York
+enablingTask: true
+parityStateChange: false
+
+## Scope
+
+The negative matrix executes production schema v2 and migration parsers against duplicate
+catalog/asset IDs, a legacy parent cycle, an inconsistent v2 `parentPath`, 64-byte UTF-8
+simple-name/tag values, and unknown top-level/nested fields in both v1 and v2. The byte cases
+use multi-byte text to prove limits are not JavaScript character counts.
+
+Every failure returns a stable asset error code. The valid v2 fixture is parsed after each
+negative case to prove the failed input did not poison parser state. This task adds negative
+evidence only and does not change catalog parity status.
+
+## Evidence
+
+- `npm --prefix web run test:asset-catalog-negatives` passed 2/2 with 9/9 negative cases.
+- Duplicate/cycle/parent/unknown cases returned `ASSET_MANIFEST_INVALID`; both 64-byte UTF-8
+  payloads returned `ASSET_BUDGET_EXCEEDED`.
+- Typecheck, lint, and `git diff --check` passed.
+
+## Artifact Hashes
+
+- unit suite: `3a11605ac8666c8c4e1e2e85ccfd423115915820d0de6f92bdf72dff1f01ce41`
+- negative cases: `74672fa0aec248fd5d9a265743ef4dfe4d417fce8a24622b8b3d6be2f95c8874`
+- manifest: `127b2b605ac79a891cd6ab516ee031c02624a512e1043b111bfac2ebf1d8278d`
+
+## Next Task
+
+`M12-01G`: prove an IndexedDB migration failure preserves the old transaction and index.
+
+## Rollback
+
+Remove the M12-01F negative suite, golden/manifest, package command, and this status entry.
+Restore M12-01F to pending and `nextTask` to M12-01F. No parity ledger rollback is required.