Auto Directimplement

Implement this issue directly (without a separate planning document).

NON-NEGOTIABLE: Deliver a 100% complete implementation of the requested scope.
NON-NEGOTIABLE: Do not stop early, do not leave partial implementation, and do not hand off unfinished work.
NON-NEGOTIABLE: You must include both a code review step and a final fix step before completion.

Workflow:
1. Read and interpret the full issue.
2. Break the work into a short execution plan with explicit phases.
3. Delegate EACH execution phase to a SEPARATE implementation subagent to control context window size.
4. Do not reuse the same implementation subagent across multiple phases.
5. Complete the full requested behavior end-to-end (100% scope coverage).
6. Add or update tests so the change is verified.
7. Run a dedicated code review step by delegating it to a separate review subagent over the complete diff.
8. Run a dedicated final-fix pass by delegating it to a separate fix subagent and implement all valid review findings.
9. Run relevant quality checks and fix failures.
10. Review the final diff for correctness and completeness.

Quality requirements:
- Follow existing patterns and conventions in the repository.
- Reuse existing abstractions and dependencies where possible.
- Do not bypass test intent to make checks pass.
- Continue until the requested behavior is fully implemented unless blocked by missing external input.
- Repeat: 100% implementation completion is required.
- Repeat: code review is required.
- Repeat: final fix pass after review is required.
- Repeat: each execution phase must be delegated to a separate implementation subagent to manage context windows.
- Repeat: every execution phase plus review/fix step must be delegated to subagents; no direct implementation work is allowed.

The issue to implement is: