Continue Blender Web parity task handoff

docs/status/M16-GAP-00249.md

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+# M16-GAP-00249 Status
+
+status: done
+task: armature.roll_clear operator LOCAL_EXACT slice
+updated: 2026-08-23 America/New_York
+
+scope:
+
+- The minimal fixture contains one selected visible edit bone with an initial
+  roll of pi/4. Blender desktop runs `ARMATURE_OT_roll_clear(roll=0)`, clearing
+  only the selected bone's roll while preserving its geometry, selection, and
+  visibility.
+- Main exposes the resulting identity rest matrix from the same fixture. The
+  comparator confirms desktop/WASM parity and save/reopen stability without
+  expanding other data-blocks, editors, or browsers.
+
+evidence:
+
+- Fixture generation, desktop checker, npm comparator, direct comparator,
+  malformed-input negative, save/reopen check, and task-context handoff passed.
+- Repeated checker execution is idempotent (`SKIPPED_ALREADY_APPLIED` after the
+  first run); Chromium-only policy was preserved and no Firefox/WebKit run was
+  made.
+
+nextTask: `M16-GAP-00250`