Checkpoint web parity through Chromium input tasks

docs/status/M12-03H.md

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+# M12-03H Status
+
+status: done
+task: library reload replaces only the matching linked generation snapshot
+updated: 2026-08-17 America/New_York
+enablingTask: false
+parityStateChange: false
+
+## Scope
+
+Schema-1 reload requests identify one `SOURCE_LIBRARY` and an expected generation/revision. The
+replacement must keep the same library identity, advance exactly one generation, advance the source
+revision, and retain a read-only source-library data-block closure. Only the unique matching snapshot
+is replaced; other libraries and other generations remain unchanged.
+
+Malformed requests, duplicate state identities, owner substitution, skipped generations, and stale
+generation/revision requests fail closed before any Main mutation. A stale request returns
+`REVISION_CONFLICT` and an unchanged state.
+
+## Evidence
+
+- `npm --prefix web run test:library-linked-reload` passed 4/4 unit tests.
+- The matching-generation case replaces one snapshot atomically while preserving a future generation
+  and an unrelated library; the input state remains immutable.
+- Stale, malformed, duplicate, owner-substituted, and non-adjacent reload cases are rejected without
+  publishing a partial state.
+
+## Artifact Hashes
+
+- protocol: `8be6f0b2abe36cd566ea7447d1b7de44c0e6a9a7351b863dfdd1372c1761060e`
+- unit: `dff866291468cc01e775fe3b3b95c632f5c0742566f79b956a0193bfd8fd43d2`
+- manifest: `dd96702dcb064779de3fc33ce1200d75615e7b75a3418a45a309e0e612fdb7df`
+- package commands: `cfb232baa494ff59f6c8d65514a08c86332ee9354350b2a0392b6f932a7ee42c`
+
+## Next Task
+
+`M12-03I`: missing library preserves a placeholder and the original source reference.
+
+## Rollback
+
+Remove the linked reload protocol, unit suite, manifest, package command, and this status entry.
+Restore M12-03G to pending and move the machine queue back to `M12-03H`. No parity ledger rollback
+is required.