feat: implement CI monitoring and agentic repair loop (monitor_ci.py)

[adamsithr]

Bounty Payout Address:

• Network: Solana (SOL)
• Address: 7jXAK7dDBwkAJT67WjPeu8cg577y3x1oMp7ZCSMV18mR

Summary

This PR implements the CI monitoring and agentic repair loop driver in monitor_ci.py to satisfy Issue #12.

Acceptance Criteria Met

• CI Monitoring & Repair (monitor_ci.py): Implemented a state machine transition driver checking GitHub Actions check run statuses.
• Isolated Context & Log Excerpts: Fetches job log details using gh api and isolates the last 20 lines as a brief excerpt for the repair delegate's prompt.
• State Transitions: Drives transition logic from CI_WAIT to REPAIR (triggering label hermes:repairing and posting log details) or BLOCKED (triggering label hermes:blocked when max attempts cap is exceeded).
• Transition Gates: Validates transition logic table in parameterized unit tests inside tests/test_monitor_ci.py.
• Local CI Passing: Clean pass for all unit tests, type checks (mypy), and ruff checks.

Closes #12