feat: add automatic worker triggering on task creation

[andyxhadji]

Summary

Implements automatic triggering of the worker agent when the triage agent creates kata tasks, eliminating the need for manual invocation or cron polling. This enables true event-driven task processing.

Changes

Core Implementation

• Config: Added WORKER_NODE_ID environment variable (default: nd-worker) to specify which worker agent to trigger
• Triage Agent: Modified create_task and create_issue_task reasoners to call app.call(f"{config.worker_node_id}.claim_task") immediately after successful task creation
• Error Handling: Graceful handling ensures task creation succeeds even if worker trigger fails (logs warning but continues)
• Deduplication: Only triggers on successful task creation, not on duplicate tasks

Testing

• Added comprehensive unit tests (tests/unit/test_task_trigger.py) with 4 test cases:
  • Verify MR task creation triggers worker
  • Verify issue task creation triggers worker
  • Ensure graceful handling of worker unavailability
  • Verify no trigger on duplicate tasks
• All 148 unit tests pass

Documentation

• Updated README.md with WORKER_NODE_ID configuration
• Updated CLAUDE.md to reflect automatic triggering behavior

Benefits

• No manual triggering - Workers automatically process tasks as they're created
• More efficient - Direct trigger vs. periodic cron polling
• Scalable - Multiple workers can compete for tasks (kata handles race conditions)
• Resilient - Task creation succeeds even if worker is temporarily unavailable
• Event-driven - True reactive architecture instead of polling-based

Technical Details

Flow:

1. Triage polls middleman for new comments/issues
2. Classifies as actionable
3. Creates kata task
4. → Immediately triggers worker.claim_task via app.call()
5. Worker claims and processes the task

Multiple Workers:
Each worker instance's claim_task will attempt to claim available tasks. Kata's assignment mechanism handles the race condition, ensuring only one worker claims each task.

Test Results

================================ 148 passed ================================

🤖 Generated with Claude Code