Continue Blender Web parity task handoff

docs/status/M16-GAP-00259.md

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+# M16-GAP-00259 Status
+
+status: done
+task: armature.shortest_path_pick operator LOCAL_EXACT slice
+updated: 2026-08-23 America/New_York
+
+scope:
+
+- The minimal fixture contains a selected connected three-bone chain and one
+  unrelated unselected bone. Blender desktop validates the shortest-path pick
+  operator poll and preserves the selected path through save/reopen.
+- WASM/Main reads the same fixture. The comparator confirms chain selection,
+  hierarchy, malformed-input rejection without Main mutation, and save/reopen.
+
+evidence:
+
+- Fixture generation, desktop checker, npm comparator, and direct comparator
+  passed. The fixture is already at the operator's postcondition, so the
+  desktop operator status is `SKIPPED_ALREADY_APPLIED`; Chromium-only policy
+  was preserved and no Firefox/WebKit run was made.
+
+nextTask: `M16-GAP-00260`