Advance Blender 5.2 web parity through M12-03D

docs/status/M12-01A.md

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+# M12-01A Status
+
+status: done
+task: inventory Blender 5.2 AssetMetaData, tag, and catalog fields
+updated: 2026-08-17 America/New_York
+enablingTask: true
+parityStateChange: false
+
+## Scope
+
+The machine inventory freezes the Blender 5.2 storage and public API surface needed before
+designing a full-parity Web catalog schema. It covers every `AssetMetaData` DNA member,
+the `AssetTag` storage and collection operations, actual `AssetMetaData` RNA properties,
+Blend read/write participation, `AssetCatalog` semantic/runtime fields, catalog definition
+file version/record order, path hierarchy rules, and the current Web v1 interface snapshot.
+
+This task deliberately does not create the desktop catalog fixture, Web schema v2,
+migrations, IndexedDB behavior, or a new verified parity slice. In particular, a source
+inventory is not evidence that Web preserves or writes the inventoried fields.
+
+## Findings
+
+- `AssetMetaData` has 14 DNA members: 10 persisted semantic/UI members, custom
+  `IDProperty` metadata, one runtime type pointer, one derived tag count, and ABI padding.
+  The real Blender runtime exposes 10 RNA properties.
+- `author`, `description`, `copyright`, and `license` are optional dynamic strings. Empty
+  values are valid Blender state; the existing Web v1 manifest currently requires non-empty
+  author/license and has no description/copyright fields.
+- `catalog_id` is the authoritative RFC4122 identity. `catalog_simple_name` is a read-only
+  recovery copy and cannot replace the UUID-to-path mapping.
+- Catalog hierarchy is implicit in a cleaned UTF-8 slash path. CDF v1 records
+  `UUID:path:simple_name`; no parent UUID is stored. Duplicate paths are legal and resolve
+  deterministically by first-loaded state and UUID.
+- Existing Web v1 directly represents catalog ID, tags, author, and license, but misses seven
+  inventoried metadata semantics and models hierarchy as an explicit `parentId` graph.
+
+## Evidence
+
+- `npm --prefix web run test:asset-catalog-inventory` passed on the first complete run:
+  `dna=14 rna=10 tag=3 catalog=3 gaps=7 next=M12-01B`.
+- The checker binds eight source SHA-256 values, extracts the RNA property declarations,
+  launches `Blender 5.2.0 LTS --factory-startup --background`, compares the actual runtime
+  property identifiers/types/read-only flags, verifies Blend IO markers and CDF v1 format,
+  and uses the TypeScript AST to freeze the current Web interfaces.
+- The inventory manifest SHA-256 is
+  `194d5fd0fef5044f5e82a51931a061e226445f0f53410af9dc0594c70a79e936`;
+  the checker SHA-256 is
+  `38839f47dbe82ad7931e5e444e124e87b64a604d9358be6d71cce7769439e57b`.
+
+## Next Task
+
+`M12-01B`: generate a desktop Blender 5.2 catalog v1 fixture and canonical JSON from the
+inventoried fields. Do not begin Web schema v2 until that desktop artifact is verified.
+
+## Rollback
+
+Remove the inventory manifest, checker, package command, and this status entry; restore
+M12-01A to pending and move `nextTask` back from M12-01B. No parity ledger rollback is
+needed because this enabling task did not change a family slice.