GitHub Bot: Detect unused packages in the projects

[konard]

Summary

• ✅ Implements automated detection of unused packages across multiple programming languages
• ✅ Supports C# (.csproj), Node.js (package.json), Python (requirements.txt), and Rust (Cargo.toml) projects
• ✅ Creates comprehensive reports with potentially unused packages
• ✅ Integrates with existing GitHub bot infrastructure using trigger pattern

Features

• Multi-language support: Detects unused packages in C#, Node.js, Python, and Rust projects
• Smart pattern matching: Analyzes source files to determine if packages are actually used
• Automated reporting: Generates detailed markdown reports with findings
• Issue-triggered: Activates when issues contain keywords like "detect unused packages"
• Seamless integration: Uses existing GitHubStorage and trigger infrastructure

Technical Implementation

• DetectUnusedPackagesTrigger: New trigger class implementing ITrigger interface
• Enhanced GitHubStorage: Added methods for repository content access and issue commenting
• Robust analysis: Checks import/using statements, require calls, and package references
• Error handling: Graceful failure handling with informative error messages

Test plan

• C# project analysis works correctly
• Node.js project analysis works correctly
• Python project analysis works correctly
• Rust project analysis works correctly
• Issue trigger condition works as expected
• Report generation produces readable markdown
• Bot builds successfully without errors
• Integration with existing bot infrastructure

🤖 Generated with Claude Code

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Resolves #115