Checkpoint web parity through Chromium input tasks

docs/status/M12-07D.md

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+# M12-07D Status
+
+status: done
+task: split STL binary and ASCII capability declarations
+updated: 2026-08-18 America/New_York
+enablingTask: true
+parityStateChange: false
+
+## Scope
+
+Pinned Blender 5.2 `WM_OT_stl_export` now generates binary and ASCII STL from the same selected
+two-triangle mesh using identical axis, scale, unit, evaluation, and modifier settings. The report
+keeps `STL_BINARY/ascii_format=false` and `STL_ASCII/ascii_format=true` as separate variants; it does
+not infer the format from the `.stl` extension or claim Web parsing/import support.
+
+## Evidence
+
+- `build_blender_5.2.0/bin/blender -b --factory-startup --python
+  tools/web/generate-stl-capability-fixtures.py -- tests/files/web/m12_stl_capability_v1
+  tests/golden/M12-07D/capability-report.json` generated a 184-byte binary STL with two 50-byte
+  triangle records and a 213-byte ASCII STL with two facets/six vertex lines.
+- `node tools/web/check-stl-capability-fixtures.mjs` matched runtime identity to M12-05A, validated
+  both independent encodings, regenerated the report/files byte-for-byte in a fresh directory, and
+  returned `stl-capability-fixtures-ok binaryTriangles=2 asciiFacets=2 deterministic=true next=M12-07E`.
+- Package hash remains frozen. This enabling task does not change N-023 parity or expose an STL UI
+  route.
+
+## Artifact Hashes
+
+- parent manifest: `0c639954900b1fcc3b8285d0f4c0ecfa5807df6cde6d1f2cd3b59c4636d71674`
+- generator: `8310104e66f246b32ac7cb4619e7f4da109baf2ece39ea670cbb6d33bd88c8b8`
+- checker: `b2ad901eaa9701436cf7bcc8aa4e40d1b2d6eda7c6c44a0af830347a37cc9ca8`
+- desktop report: `29c7d2a6e6764440c99eec25bb5760c7e0880839691757fb3e607ed4f5050013`
+- binary/ASCII fixtures: `50161172cd12e4240067064db6f80e74b2df69c475e3e34154e9d0523928c1ca` /
+  `a463a5add8be070fb67b34f00ef6e7b46025aed31fa429d4a033d75a11cf0113`
+- package: `cfb232baa494ff59f6c8d65514a08c86332ee9354350b2a0392b6f932a7ee42c`
+- manifest: `bbc78e47f389562e7d648bf49c9b3bf8a08aaa36e914589a6eab0a1f6e72748d`
+
+## Next Task
+
+`M12-07E`: STL normal, unit, degenerate-triangle, and trailing-byte parity.
+
+## Rollback
+
+Remove the STL capability generator, checker, fixtures, report, manifest, and this status entry.
+Restore M12-07C as the queue tail and move the machine queue back to M12-07D. No parity ledger rollback
+is required.