- Add TaskStatusEnum to enumerate valid status values (pending, in_progress, completed, skipped, dismissed)
- Add TaskStatusUpdateRequest Pydantic model with validation
- Constrain completion_notes to max 4000 characters
- Automatically enforce schema validation and improve OpenAPI docs
- Update set_task_status endpoint to use typed request body
- Remove need for manual status validation (FastAPI handles it)
- Preserve dependencies normalization helper and all usages
- Preserve date validation and narrower exception handling from PR #396
- Keep proper feedback scoring using task.status from database
- Keep contextuality validation response fields intact
- Maintain all observability and error handling improvements
- Improve API robustness through type safety
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