/pr-comments skill missing review comments from pull request reviews

Problem

The /pr-comments skill only fetches PR-level comments from issues/{number}/comments but misses review comments from pull request reviews.

Expected Behavior

The skill should return:

• PR-level comments (currently working ✅)
• Review comments from pull request reviews (missing ❌)
• CodeRabbit review threads
• Copilot review comments
• Code review comments with diff context
• Review state (APPROVED, CHANGES_REQUESTED, COMMENTED)

Current Behavior

Running /pr-comments on a PR with multiple code review findings only shows generic PR comments, missing critical review feedback.

Example

PR with CodeRabbit findings showing:

• CHANGES_REQUESTED reviews with specific file/line comments
• Detailed analysis and suggestions
• Proposed code fixes

But /pr-comments doesn't return these, requiring manual GitHub link lookup.

Suggested Fix

Enhance the skill to fetch from:

• GET /repos/{owner}/{repo}/pulls/{number}/reviews (review metadata)
• GET /repos/{owner}/{repo}/pulls/{number}/comments (inline review comments)
• Format with file paths, line numbers, and review context

Impact

This makes /pr-comments incomplete for code review workflows where most feedback is in review threads, not PR-level comments.