Continue Blender Web parity task handoff

docs/status/M16-GAP-00242.md

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+# M16-GAP-00242 Status
+
+status: done
+task: armature.fill operator LOCAL_EXACT slice
+updated: 2026-08-22 America/New_York
+
+scope:
+
+- The minimal fixture contains a source bone tail and target bone head selected as the two fill endpoints, plus one independent unselected bone.
+- Desktop runs `ARMATURE_OT_fill` in edit mode with `poll=true` and `FINISHED`, creating `WebGapArmatureFillBridge` between source tail and target head while preserving the original source/target and independent bone through save/reopen.
+- Main exposes the bridge bone name, parent ID, selection state, connected flag, and parent-relative head/tail coordinates; the comparator normalizes desktop armature-space coordinates against the source tail without expanding other data-blocks, editors, or browsers.
+
+evidence:
+
+- The generator, desktop checker, npm comparator, direct comparator, malformed-input negative, save/reopen check, and task-context checks passed.
+- WASM/Main observes the filled bridge with desktop-matching normalized geometry and selection, rejects malformed Blend input without Main mutation, and remains stable across save/reopen.
+- Repeated checker runs recognize the already-filled state and remain idempotent; Chromium-only policy was preserved and no Firefox/WebKit run was made.
+
+nextTask: `M16-GAP-00243`