feat: implement step 6 (award) for procurement tracker

[josbell]

Summary

Implements Step 6 (Award) of the Procurement Tracker workflow, allowing CORs to track and complete the final award milestone in the procurement lifecycle.

Changes

Backend

• Added database migration with 12 new award_* fields for Step 6
• Implemented 3 validation rules:
  • AwardCompletionRequiredFieldsRule - validates required fields and date constraints
  • AwardApprovalRequiredRule - enforces approval_status = APPROVED before completion
  • AwardAgreementDataRequiredRule - validates Vendor and CLINs exist for contracts
• Updated service layer field mapping and auto-advance logic
• Fixed schema to preserve AWARD approval fields in API responses
• Added unit and integration tests (8 integration tests covering full flow)

Frontend

• Created Step 6 component with 3 render states (read-only, active form, completed)
• Implemented Vest v6 validation suite for date and user fields
• Created custom hook for state management and API integration
• Built Request Award Approval page with Step 5 prerequisite check
• Integrated into main procurement tracker with feature flag gate
• Added route /agreements/:id/award-approval
• Added TypeScript types and component tests

Testing

• Backend unit tests pass
• Backend integration tests pass (8 tests)
• Frontend validation suite tests pass
• Backend linting passes
• Frontend linting passes
• Manual QA (pending)
• E2E tests (pending)
• CI passes (pending)

Manual QA Checklist

See implementation summary at .claude/stories/OPS-1640-step-6-implementation-summary.md (local only, not in repo)

Key flows to test:

1. Save target completion date
2. Request award approval
3. Complete step after approval approved
4. Validation errors (missing vendor, missing CLINs, no approval)
5. Step 5 prerequisite check
6. BLI in review check

Known Limitations

• Approval workflow saves state only - actual Division Director approval flow not implemented
• For testing, manually set approval_status = "APPROVED" in database
• Email notifications not implemented

Related Issues

Closes #1640

🤖 Generated with Claude Code

Co-Authored-By: Claude Sonnet 4.5 noreply@anthropic.com