Advance Blender 5.2 web parity through M12-03D

docs/status/M12-01C.md

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+# M12-01C Status
+
+status: done
+task: define Web catalog schema v2, stable identities, and budgets
+updated: 2026-08-17 America/New_York
+enablingTask: true
+parityStateChange: false
+
+## Scope
+
+Schema v2 represents Blender catalogs with canonical RFC4122 UUIDs and cleaned slash paths;
+hierarchy is derived from `parentPath`, matching CDF semantics instead of retaining the Web v1
+`parentId` graph. Asset identity binds Blender's `AssetWeakReference` fields
+(`asset_library_identifier`, `relative_asset_identifier`) into a SHA-256 Web ID. A Blender
+rename changes the relative identifier and therefore the stable ID, matching Blender's weak
+reference behavior rather than promising an identity Blender does not provide.
+
+All text budgets use UTF-8 bytes. Catalog/tag recovery strings keep Blender's 63-byte payload
+limit, dynamic metadata permits empty strings, and catalog, asset, tag, custom-property,
+custom-array, per-string, and aggregate-text counts are bounded. The positive schema fixture
+is generated from the verified M12-01B desktop canonical report through production protocol
+code. This task does not implement v1 migration, legacy-reader policy, IndexedDB migration, or
+catalog mutation.
+
+## Evidence
+
+- `npm --prefix web run test:asset-catalog-v2` passed 4/4.
+- The suite binds the desktop canonical report and Blender 5.2 weak-reference source, regenerates
+  schema v2 from the desktop report, parses the generated golden, and verifies deterministic
+  local/external identity hashes and exposed UTF-8/collection budgets.
+- `npm --prefix web run typecheck`, `npm --prefix web run lint`, and `git diff --check` passed.
+
+## Artifact Hashes
+
+- protocol: `0949838efb2f69466368185b80bb1d2e851672d78311fcd5270eb0814576e5d7`
+- generator: `b20e7dbd8508ca8ecf17d7da507b45b1225315bac7759c55c7b324683d660881`
+- unit suite: `73038022124ddc7e683602b47a4804297b3a64ecd4819160c7ec086d2f6190ae`
+- schema golden: `2abe279cebbffd1341dc61b1fdc5366dd1f6f42769ba36171782019ca61fb929`
+- manifest: `612892b03a689ebe19804e495bd29744634ab43a3b29fff41adc2d7a5d0b67b9`
+- Blender weak-reference source: `ace3d6468bcdb2f6190431e967495794b7afa35758fd82fc3941b1ce7d374635`
+
+## Next Task
+
+`M12-01D`: define and verify schema v1 to v2 forward migration.
+
+## Rollback
+
+Remove the schema v2 protocol, generator, unit suite, M12-01C golden/manifest, package command,
+and this status entry. Restore M12-01C to pending and `nextTask` to M12-01C. No parity ledger
+rollback is required.