- InventoryService: registerItem, recordMovement, getStockLevels, getItemMovements, listItems
- RECEIVED movements auto-post JE (DR 1200 Equipment Inventory, CR 2010 AP)
- Stock levels derived from movement aggregation (no mutable quantity column)
- All 5 movement types validated with type-specific rules
- API routes: POST/GET items, GET item detail, POST/GET movements, GET stock-levels
- CASL: OFFICE_STAFF gets manage Inventory permission
- Migration applied: add_inventory_models (4 enums, 2 tables)
- 13 tests: registration, all movement types, stock derivation, JE posting, history
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
