Final review & cleanup

**Description**  
Polish release: verify health, update docs, close redundant tasks.

**Acceptance Criteria**

- Health endpoints green; demo works end-to-end.
    
- README & Postman reflect final endpoints.
    

**Technical Notes**

- Tag a lightweight release in Git.
    

**Test Notes**

- Manual system test pass.
    

**Subtasks**

-  Final QA checklist
    
-  Close issues