M12-01E Status

status: done task: define schema v2 behavior for a schema v1 reader updated: 2026-08-17 America/New_York enablingTask: true parityStateChange: false

Scope

A native schema v1 document remains READY. A valid schema v2 document exposed to a v1 reader yields a bounded READ_ONLY snapshot for metadata inspection, while catalog writes, asset writes, and save all return ASSET_SCHEMA_DOWNGRADE_BLOCKED. Unknown future schema versions return non-recoverable PROTOCOL_MISMATCH with no snapshot.

Every result binds a canonical source SHA-256. Inspection does not mutate or downgrade the source document, and no write path can serialize the lossy read-only projection. This task defines compatibility behavior only; it does not implement IndexedDB migration or catalog mutation parity.

Evidence

npm --prefix web run test:asset-catalog-legacy-reader passed 4/4.
Generated evidence covers v2 read-only metadata, all three write/save blocks, native v1 readiness, future-schema rejection, equal source hashes, and source object immutability.
M12-01C/D regressions, typecheck, lint, and git diff --check passed.

Artifact Hashes

compatibility protocol: 5d51029b232e03f08fc0778d4933910b2a54818b4d653fbcc185c8d764641349
error contract: 309ab84d5c755a69466ddb73e4b54e87caf62cbcac0f10f34d904e9f6f4a5f34
generator: 208f568db092e1712095d77ab28db92d5a1eb11fe62813b237ce466f9268fd4e
unit suite: f6477222412044e6784b64c1be83dc9bd6050fe6a955ba5430a4ea963b20dbb4
compatibility report: 3c2f9241b56ad5bd742dc4152dec703bdc56eef4e6d8d60e6edf163c4571ad54
manifest: cf55ea1f9430df04fb55bf07c68c1b2099b044b0da0fdb07a7251b13c459724b

Next Task

M12-01F: add duplicate ID, cyclic parent catalog, overlong text, and unknown-field negatives.

Rollback

Remove the compatibility protocol, generator, unit suite, M12-01E report/manifest, error code, package command, and this status entry. Restore M12-01E to pending and nextTask to M12-01E. No parity ledger rollback is required.

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