Continue Blender Web parity task handoff

docs/status/M16-GAP-00211.md

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+# M16-GAP-00211 Status
+
+status: done
+task: anim.start_frame_set operator LOCAL_EXACT slice
+updated: 2026-08-22 America/New_York
+
+scope:
+
+- The minimal scene starts at frame 42 with a scene range of 1-120. The foreground animation-area context invokes `ANIM_OT_start_frame_set` (`poll=true`, `FINISHED`) and sets the scene start frame to 42.
+- The existing Main reader exposes the same scene frame tuple through `Scene.r.cfra`, `Scene.r.sfra`, and `Scene.r.efra`; no unrelated data-block, editor, or browser behavior was changed.
+
+evidence:
+
+- Desktop evidence records `FRAME_START_SET` and exact save/reopen. Repeated comparator runs preserve the fixture hash and report shape.
+- WASM/Main observes `{current: 42, start: 42, end: 120}` from the same fixture, preserves it across save/reopen, and rejects malformed Blend input without Main mutation.
+- The generator, npm comparator, direct comparator, and task-context checks passed. Chromium-only policy was preserved; no Firefox/WebKit run was made.
+
+nextTask: `M16-GAP-00212`