Continue Blender Web parity task handoff

docs/status/M16-GAP-00201.md

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+# M16-GAP-00201 Status
+
+status: done
+task: anim.previewrange_set operator LOCAL_EXACT slice
+updated: 2026-08-22 America/New_York
+
+scope:
+
+- The minimal fixture uses the active Dope Sheet animation region and a deterministic border gesture to set the Scene preview range to `2..6` through `ANIM_OT_previewrange_set`.
+- WASM/Main observes the same `previewRange` and frame bounds; no reader, protocol, or browser change was required.
+
+evidence:
+
+- Desktop evidence records the animation-region poll, `FINISHED`, `PREVIEW_RANGE_SET`, the `2..6` values, and exact save/reopen.
+- WASM/Main compares the preview range from the same fixture, preserves it across save/reopen, and rejects malformed Blend input without Main mutation.
+- Fixture generation, desktop checker, npm comparator, direct comparator, and task-context checks passed. Chromium-only policy was preserved; no Firefox/WebKit run was made.
+
+nextTask: `M16-GAP-00202`