Checkpoint web parity through Chromium input tasks

docs/status/M12-03F.md

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+# M12-03F Status
+
+status: done
+task: create a desktop linked Object fixture preserving source-library ownership
+updated: 2026-08-17 America/New_York
+enablingTask: true
+parityStateChange: false
+
+## Scope
+
+Blender 5.2 creates a source library containing one Object with a Mesh, Material, and packed Image
+dependency closure. A clean target links only the selected Object with `bpy.data.libraries.load(link=True)`.
+The Object, Mesh, Material, and Image retain the source library pointer, have no library override,
+and map to read-only `SOURCE_LIBRARY` ownership. The target is saved, reopened in a new Main load,
+and compared to the pre-save linked graph.
+
+This task freezes the desktop LINK contract only. It does not implement a WASM link writer, linked
+mutation, reload/relocate, missing-library placeholders, or full N-023 parity.
+
+## Evidence
+
+- `npm --prefix web run test:library-link-desktop` passed the manifest/artifact hash gate, Blender
+  5.2 generator rerun, and canonical report comparison.
+- The fixture links one root and four dependency IDs. All three dependency edges, 4 vertices, 4
+  edges, 1 polygon, 4 loops, `UVMap`, material slot, packed 2x2 sRGB RGBA image, and Float32 pixel
+  SHA-256 `6f0f8c231d65149e69e6ed12d370bcfa095ef90adc202065492ea8c8ef17e45a` survive save/reopen.
+- Every linked ID reports `library=m12_link_source.blend` and `isLibraryOverride=false`; all four
+  stable mappings are `SOURCE_LIBRARY/readOnly=true`. A temporary source/target regeneration matches
+  the canonical report after normalizing only session-bound blend container hashes.
+
+## Artifact Hashes
+
+- generator: `15a2e34c1c5b2a8ee63b10084dbb894e0f9677b9e1cf4adb7e2ddce6b4c965b1`
+- checker: `6a4c024bea227d7bc14f793467b91766b006459fe4d7717cc75dfee12f49f894`
+- source `.blend`: `fae97569e9d2e2066fc92749672f86cc42717cd9b97b012faeb9eb92015d7fd1`
+- target `.blend`: `acdaf0f297deb08c84e1a8beba30972e3414ef62e60e3b103fe0661199c438a1`
+- desktop report: `b278d4c254eff63d41c8cb3ea1d5e0984192137d45b1695ba0672e16f95b58ea`
+- manifest: `8220a8f5d560d45a75a62cbed645b3febc1390fe37b07c3c48871fefc1a9b159`
+- package commands: `336d8df1914aaaafaeccc181d4e73ed7058165f10e167efe539939c3ac1e0536`
+
+## Next Task
+
+`M12-03G`: linked data writers must fail closed with `LINKED_DATA_MUTATION_BLOCKED`.
+
+## Rollback
+
+Remove the M12-03F link generator/checker, source and target fixtures, desktop report/manifest,
+package command, and this status entry. Restore M12-03E to pending and move the machine queue back
+to `M12-03E`. No parity ledger rollback is required.