Checkpoint web parity through Chromium input tasks

docs/status/M12-07A.md

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+# M12-07A Status
+
+status: done
+task: OBJ single-Mesh desktop positive fixture
+updated: 2026-08-18 America/New_York
+enablingTask: true
+parityStateChange: false
+
+## Scope
+
+Pinned Blender 5.2 `WM_OT_obj_export` now generates one deterministic Wavefront OBJ object with
+four positions, four UV coordinates, one explicit normal, two triangle faces, two material records,
+and two material groups. The `.mtl` sidecar is kept beside the OBJ and both files are bound to the
+canonical semantic report. Web parsing/import, multi-object and negative cases remain queued.
+
+## Evidence
+
+- `build_blender_5.2.0/bin/blender -b --factory-startup --python
+  tools/web/generate-obj-single-mesh-fixture.py -- tests/files/web/m12_obj_desktop_v1
+  tests/golden/M12-07A/desktop-fixture.json` completed with 4 positions, 4 UVs, 1 normal,
+  2 faces, and 2 materials/groups.
+- `node tools/web/check-obj-single-mesh-fixture.mjs` passed deterministic regeneration in a fresh
+  temporary directory and byte-for-byte OBJ/MTL comparison:
+  `obj-single-mesh-fixture-ok vertices=4 normals=1 uv=4 faces=2 materials=2 deterministic=true next=M12-07B`.
+- Runtime identity matches the pinned M12-05A Blender 5.2 inventory; the report is anchored to
+  `blender-5.2.0/source/blender/io/wavefront_obj` and `wm.obj_export`.
+- Package hash remains frozen; no Web route or parity ledger status was changed.
+
+## Artifact Hashes
+
+- parent manifest: `1c732b8d9f1a0bdb502f44e2e843e91efea12e93483a35658f8a9c70a69a2430`
+- generator: `604c3006f194c7c64a487b8f760693b66830f3cfa602928b46769955e7d4f358`
+- checker: `3d0208f61a86d4d29796d8284756f53931c90864b15b7dfe4fcc84d7f65a8040`
+- desktop report: `6c560a8eecf84973c2b05f9fd50d33bd45515e97c4f7970f1502de406c39f6a5`
+- OBJ/MTL: `a56694d1ee28735c68381ff18c3a52581612feebac0101a53e502956c27d144f` /
+  `392f1b10ff5a0b142d520a9443b4c96191985f15d4244c79b36fdeda0f153715`
+- runtime inventory: `0d660b0fd8b647ebbf4e91afebd5006bd100973ab8e2507a5bfe759f477b33b4`
+- package: `cfb232baa494ff59f6c8d65514a08c86332ee9354350b2a0392b6f932a7ee42c`
+- manifest: `d80b74502202effa7be15640c945dc7e04af703b58e7a15c3fe7babc43c17b46`
+
+## Next Task
+
+`M12-07B`: OBJ multi-object, negative-index, MTL/texture-origin, and malformed-face cases.
+
+## Rollback
+
+Remove the OBJ generator, checker, desktop report, OBJ/MTL fixture, manifest, and this status entry.
+Restore M12-06G as the queue tail and move the machine queue back to M12-07A. No parity ledger rollback
+is required.