# TANRAIL ONE — Phase 3.2.3 Verification Gate

## VERDICT: PASS

### Verification Summary
The Core Sales Engine implementation strictly adheres to the TANRAIL ONE architecture. It successfully bridges Phase 2 (Security Context) and Phase 3.2 (Inventory) without compromising the business-agnostic foundation.

### Test Results
- **Phase 3.2.3 Sales Engine Tests**: 24/24 Passed.
- **Full Regression Suite**: 65/65 Passed (105 Assertions).
- **Failures / Errors**: 0

### Architectural Compliance
1. **Business Isolation**: Verified. `Order` records are strictly ring-fenced to their respective Business Units. Cross-BU item insertions are blocked at the Service layer.
2. **Inventory Integrity**: Verified. Negative stock scenarios successfully terminate the Database Transaction, reverting the `Order` to `DRAFT`.
3. **Data Immutability**: Verified. `OrderLine` and `Payment` mutations are explicitly blocked via `booted()` Observers after state confirmation.
4. **Module Boundaries**: Verified. The Core contains zero references to Restaurant, Catering, POS, or Water Distribution.

## Next Steps
Development on Phase 3.2.3 is officially complete. Do NOT automatically proceed to Phase 3.2.4 or Phase 3.3. Wait for explicit Human authorization to proceed to the next phase of the roadmap.