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

.specify/specs/001-interiorscan-mvp/data-model.md

@@ -148,6 +148,31 @@ export const processingJobs = pgTable('processing_jobs', {
   createdAt: timestamp('created_at').defaultNow().notNull(),
 });
 
+// ── Catastro Data ─────────────────────────────────────
+
+export const catastroData = pgTable('catastro_data', {
+  id: cuid2('id').primaryKey(),
+  projectId: cuid2('project_id').references(() => projects.id).notNull(),
+  refcat: text('refcat'),                          // 14-20 digit cadastral reference
+  addressNormalized: text('address_normalized'),    // Normalized address from Catastro
+  buildingFootprint: jsonb('building_footprint'),  // GeoJSON polygon from INSPIRE WFS
+  buildingHeight: text('building_height'),          // e.g., "12.5" meters
+  numberOfFloors: integer('number_of_floors'),      // From Catastro
+  floorArea: text('floor_area'),                    // m² from Catastro
+  gmlSource: text('gml_source'),                    // URL of the GML source file
+  fetchedAt: timestamp('fetched_at').defaultNow().notNull(),
+});
+
+export const catastroImports = pgTable('catastro_imports', {
+  id: cuid2('id').primaryKey(),
+  projectId: cuid2('project_id').references(() => projects.id).notNull(),
+  format: text('format').notNull(),   // 'dxf', 'svg', 'png', 'gml'
+  originalKey: text('original_key'),   // S3 key for uploaded file
+  parsedWalls: jsonb('parsed_walls'),  // Array of {x1, z1, x2, z2, height, thickness}
+  source: text('source').notNull(),    // 'catastro', 'upload', 'manual'
+  createdAt: timestamp('created_at').defaultNow().notNull(),
+});
+
 // ── Subscriptions ───────────────────────────────────
 
 export const subscriptions = pgTable('subscriptions', {