Continue Blender Web parity task handoff

docs/status/M16-GAP-00250.md

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+# M16-GAP-00250 Status
+
+status: done
+task: armature.select_all operator LOCAL_EXACT slice
+updated: 2026-08-23 America/New_York
+
+scope:
+
+- The minimal fixture contains two visible edit bones with only the parent bone
+  initially selected. Blender desktop runs `ARMATURE_OT_select_all(action=SELECT)`,
+  selecting both visible bones and both endpoints while preserving geometry.
+- Main exposes the saved selected flags and geometry 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-00251`