feat(m2): V64 K2 obstacle seeds - all 10 halls now obstacle-aware
Owner directive 2026-07-15: extend obstacle recognition to K2 (halls 6-10).
- tools/cad/extract_obstacle_seed_k2.py: same 1m-cell raster + row-strip
method as K1, plus hall-frame rotation transform (+-11..12deg wings)
- 31 measured strips: edge doors, service-room walls, and the full-width
midline door strips on H9/H10 = the A/B divider shutter tracks - the 1.0m
door buffer keeps the shutter travel line clear (operationally correct)
- Layers: ELEVATOR, STAIR, DOOR, gypsum/lightweight-steel/cement-panel walls
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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