feat(ci): enhance ci/cd watcher to monitor and handle pr comments

[arielshad]

Summary

Enhance the CI/CD watcher to monitor comments left on PRs and handle them automatically.

Motivation

Currently the CI/CD watcher only tracks workflow run status (pass/fail). It does not monitor or respond to comments left on PRs — such as review comments, bot comments, or automated feedback. Adding this capability would allow the watcher to:

• Detect actionable review comments and surface them
• Respond to or process bot-generated comments (e.g., security scan results, coverage reports)
• Auto-handle common comment patterns (e.g., approve, request changes, lint suggestions)

Acceptance Criteria

• CI/CD watcher polls for new PR comments during watch cycles
• Comments are categorized (review feedback, bot output, actionable vs informational)
• Actionable comments trigger appropriate handling (e.g., auto-fix suggestions, flagging blockers)
• Results are surfaced to the user in the CLI/TUI

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