Checkpoint web parity through Chromium input tasks

docs/status/M12-06E.md

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+# M12-06E Status
+
+status: done
+task: desktop Blender re-imports Web GLB and compares canonical report
+updated: 2026-08-18 America/New_York
+enablingTask: false
+parityStateChange: false
+
+## Scope
+
+The four Web GLBs that produced bytes in M12-06D (PBR, UV, skin and animation) are re-imported by
+the pinned Blender 5.2 desktop runtime, saved as `.blend`, reopened, and emitted as canonical graph
+reports. The checker binds each Web output hash to the M12-06D report and compares Object/Mesh/
+Material/Image/Armature/Action graph fields against the M12-06C desktop-import baseline.
+
+PBR and animation are exact. UV records four explicit differences (corner-expanded vertex topology
+and Blender's generated texture Mix node); skin records 31 explicit differences (the exporter emits
+an additional armature helper mesh and Blender's re-import tessellation changes). These are recorded
+machine mismatches, not silently treated as parity. The N-023 parity ledger remains blocked and this
+task does not claim lossless GLB round-trip.
+
+## Evidence
+
+- `node tools/web/check-glb-web-reimport.mjs` passed artifact hashes, four Web GLB source bindings,
+  pinned Blender regeneration determinism, save/reopen stability, and canonical comparison. Output:
+  `glb-web-reimport-ok fixtures=4 exact=2 mismatched=uv,skin deterministic=true next=M12-06F`.
+- The report binds Web GLB hashes `pbr=1ab793...`, `uv=8bd045...`, `skin=4a45d0...` and
+  `animation=b83de1...`; exact/mismatch counts are fixed at PBR 0, UV 4, skin 31, animation 0.
+- The Web export Chromium test that produced the inputs passed 1/1; the desktop generator performs
+  a fresh Blender import/save/reopen for every input. `npm --prefix web run typecheck` and
+  `git diff --check` passed.
+
+## Artifact Hashes
+
+- parent manifest: `c01c5861d493e1f177e8cde3038bc5283a7671fa39bf84484662d307623325a2`
+- generator: `3ae1ba45e15cae5d0308fc3fcb3766764cd374c096e27eaaddba9228a3d75004`
+- checker: `c21b45a975ec70586da1b9e50b8cf4ccf74644300b4f381c3fee0ad735cfcdb9`
+- desktop report: `e4d03d25cfac3c4beff4d0af0769b1c39b058670c679c12f4a11ae30d2d91f3c`
+- Web export test: `ce334b6bb5d82c133d317e916c03711029fba1c19c634dec06c06da9eddbd776`
+- PBR Web GLB: `1ab7936fae6e0c28e1b90e8a6ae24b3893c075c9fc58ac8896f780fdefb8277e`
+- UV Web GLB: `8bd045388527ddad7cf886c0c7a2a45b6e7d6db603568a10a959bc6d423ae145`
+- skin Web GLB: `4a45d00dfa23638682bb61a4f74b283bcd986126da4890d068902e3c85efc332`
+- animation Web GLB: `b83de103df3f5a49487868f3ede3046875c90b0d084bbd998511c3a7c987a4fa`
+- package: `cfb232baa494ff59f6c8d65514a08c86332ee9354350b2a0392b6f932a7ee42c`
+- manifest: `3d3b13fd54a314fd6f6907fc2d314e66ef74e8ca770a8accd823370d272737fc`
+
+## Next Task
+
+`M12-06F`: sparse accessor, Draco/extension, external URI and over-budget negative cases.
+
+## Rollback
+
+Remove the desktop Web re-import generator/checker, manifest, report, four Web GLB fixtures, and
+this status entry. Restore M12-06D as the queue tail and move the machine queue back to M12-06E. No
+parity ledger rollback is required.