Checkpoint web parity through Chromium input tasks

docs/status/M12-03M.md

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+# M12-03M Status
+
+status: done
+task: dependency cycle, ID collision, cross-library cycle, and duplicate reload negatives
+updated: 2026-08-17 America/New_York
+enablingTask: false
+parityStateChange: false
+
+## Scope
+
+Schema-1 negative-case validation checks library dependency graphs, cross-library references,
+data-block identity ownership, and reload generation identities. Acyclic graphs with unique IDs are
+accepted; dependency/cross-library cycles, missing source libraries, duplicate data-block IDs, and
+duplicate reload generations fail with stable codes before any writer or Main mutation.
+
+## Evidence
+
+- `npm --prefix web run test:library-negative-cases` passed 4/4 unit tests.
+- Direct dependency cycles and cross-library cycles return `LIBRARY_DEPENDENCY_CYCLE`.
+- Data-block collision returns `TASK_VALIDATION_FAILED`; duplicate reload returns `REVISION_CONFLICT`;
+  a missing source library returns `ASSET_SOURCE_HASH_MISMATCH`.
+
+## Artifact Hashes
+
+- protocol: `efc7cc810089eab6178fc5c2f2a45d641625a032ecfa5b2b4ef37694d0decc97`
+- unit: `b7ae41b2c35b2fe1598bca4425dd434230bfe4bf342320c88214a060dcbb0a16`
+- manifest: `693cbedfe8e29167283a753d119de5a9cfe5e20bc96aff7ba84d720ffde9148a`
+- package commands: `cfb232baa494ff59f6c8d65514a08c86332ee9354350b2a0392b6f932a7ee42c`
+
+## Next Task
+
+`M12-03N`: append/link/override each receive independent desktop/WASM/Chromium commands.
+
+## Rollback
+
+Remove the negative-case protocol, unit suite, manifest, package command, and this status entry.
+Restore M12-03L to pending and move the machine queue back to `M12-03M`. No parity ledger rollback
+is required.