feat: add catastro SSOT integration, 3DGS hybrid pipeline, casa demo v3
- SPEC: add User Story 0 (Property Setup via Catastro) as P1 entry - SPEC: add catastro_data and catastro_imports tables to data model - PLAN: add Phase 2A (Catastro Integration) with 8 tasks - AGENTS.md: add 3 key decisions (Catastro SSOT, 3DGS hybrid, plan inputs) - Demo v3: Spanish apartment (C/ Altabix 24, 3ºB, Elche), 7 rooms, upload panel for catastro/DXF, proper collisions on all doors
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