Advance Blender 5.2 web parity through M12-03D

docs/status/M12-01H.md

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+# M12-01H Status
+
+status: done
+task: preserve catalog order and asset identity across page and Worker restarts
+updated: 2026-08-17 America/New_York
+enablingTask: true
+parityStateChange: false
+
+## Scope
+
+The production catalog index loader validates the stored schema v2 manifest, recomputes its
+canonical SHA-256, and compares it with the committed migration receipt before publishing a
+snapshot. The snapshot exposes persisted catalog order, asset order, stable asset IDs, Blender
+weak-reference components, revision, and manifest identity.
+
+A page migrates the M12-01D v1 fixture, reloads, and reads the same database again. Two separate
+module Workers then open the database in sequence, with generation 1 terminated before
+generation 2 starts. All four contexts must return the same complete snapshot.
+
+## Evidence
+
+- `WEB_TEST_PORT=5594 npm --prefix web run test:asset-catalog-restart` passed Node 5/5 and
+  Chromium 2/2, including the full M12-01G abort/reopen regression.
+- Initial page, reloaded page, Worker generation 1, and Worker generation 2 returned exactly the
+  same 3 catalog IDs in order, 2 asset IDs in order, weak-reference components, revision 7, and
+  manifest SHA-256.
+- A stored receipt whose target hash or revision drifts from the parsed v2 index is rejected as
+  `ASSET_MANIFEST_INVALID` before a snapshot is published.
+- Typecheck, lint, and `git diff --check` passed.
+
+## Artifact Hashes
+
+- production IndexedDB reader: `283a08bccb5ea301bd2aef8f01d4496972e3962f75e340479336c50e3539ba57`
+- restart Worker: `e6007d352555be046b89d0becd719692652ee0418cc97087bf7599155f2a538e`
+- browser suite: `7945ff38dd474a74c265594b66534a280eb69407509137e60d41f1bea3b3c19b`
+- artifact unit: `eb22b5cc852fa47d9bdd30afec2977facfca0dfa554e7ce738dc1bf8c4bf2122`
+- manifest: `59138eb83d63ae0d397b152e587fbe005d02bc2d229ee484c279b452ea3f2eae`
+
+## Next Task
+
+`M12-01I`: bind the schema fixture, migration report, and hashes into M12-01 evidence.
+
+## Rollback
+
+Remove the restart snapshot reader, Worker/browser/unit suites, M12-01H manifest, package
+command, and this status entry. Restore M12-01H to pending and `nextTask` to M12-01H. No parity
+ledger rollback is required.