Checkpoint web parity through Chromium input tasks

docs/status/M12-03N.md

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+# M12-03N Status
+
+status: done
+task: append/link/override each receive independent desktop/WASM/Chromium commands
+updated: 2026-08-17 America/New_York
+enablingTask: false
+parityStateChange: false
+
+## Scope
+
+Append, LINK, and library override each have independent desktop, WASM, and Chromium commands. The
+commands are bound to distinct fixtures/protocol tests/browser specs and use separate Chromium ports.
+The command checker verifies all nine package entries and their lane-specific targets.
+
+## Evidence
+
+- `npm run test:library-operation-commands` passed with 9 independent commands: 3 operations x 3 lanes.
+- Desktop: append fixture, LINK fixture, and Blender 5.2 override fixture all passed.
+- WASM: append receipt protocol passed 2/2; LINK aggregate passed 11/11; override aggregate passed 8/8.
+- Chromium: append passed 1/1; LINK gate passed 1/1 on port 5195; override writer passed 1/1 on port
+  5196. Append Chromium passed 1/1 on port 5194.
+
+## Artifact Hashes
+
+- command checker: `3564347393134d835fdf279b8b8f58558ee24fe0165c3b4527195d094a451e98`
+- append WASM protocol: `bfd98561cbe797d7b8f07c92c53a25460c839a64ab7222b7795cf58d54dff8d7`
+- append WASM unit: `75fc2d626f7ca7e820e9cacf659a453886e15e790cde43348828c03bed752ec7`
+- append Chromium: `101f67d35c2320da57459f08a59687d769234b910dbd9aaec5a668cee7e0f9f0`
+- link Chromium: `814e3486522fb4f0ffdd59acd385a4fca9c5660cdb07e5a2acb1cadd70376bff`
+- override Chromium: `1c12982b4eb4fb4b9a3c88907a842a1fc413b3a3a760a9f57b350f57060d007f`
+- manifest: `e4cccc8edc277b5047c3f8006ea40b26b119d28589fe2f3bd9bfa4cc3575c85a`
+- package commands: `cfb232baa494ff59f6c8d65514a08c86332ee9354350b2a0392b6f932a7ee42c`
+
+## Next Task
+
+`M12-04A`: library source schema accepts only declared HTTPS origins, project assets, or user-selected files.
+
+## Rollback
+
+Remove the independent command checker, lane-specific tests/wrappers, manifest, package commands, and this
+status entry. Restore M12-03M to pending and move the machine queue back to `M12-03N`. No parity ledger
+rollback is required.