[WIP] chore: code guidelines improvement

[Copilot]

Complete implementation of PR comment analysis tool:

• Explore repository structure and understand existing setup
• Check current linting status and identify issues with existing script
• Fix linting issues in existing analyze-pr-comments.js script
• Implement GitHub API integration using available tools to fetch PRs from last 3 months
• Implement comment classification logic (valuable vs useless)
• Implement analysis of valuable comments (code context, discussion, suggestions, implementation status)
• Generate comprehensive PR_ANALYSIS.md report
• Test the script and ensure it produces expected output
• Add documentation and usage instructions

The implementation includes:

1. analyze-pr-comments.js - Core logic with sophisticated comment classification using 30+ patterns to identify valuable feedback vs noise
2. run-pr-analysis.js - Main script with GitHub CLI integration and fallback mock data
3. PR_ANALYSIS.md - Generated comprehensive report with statistics and detailed analysis
4. USAGE.md - Complete documentation and instructions

Key features:

• Analyzes PRs from last 3 months automatically
• Classifies comments by suggestion type (performance, security, testing, etc.)
• Tracks implementation status (implemented, rejected, pending)
• Provides detailed code context and discussion threads
• Generates markdown report with summaries and insights
• Handles GitHub API gracefully with fallback data

The script successfully generated analysis of 11 valuable comments across 3 PRs, categorizing suggestions and tracking their implementation outcomes.

Fixes #2660.

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