DEN-5771: Initialize CLAUDE.md

[harshal-shah]

Summary

This PR adds CLAUDE.md to help Claude Code understand the auto-pr repository better.

The documentation includes:

• Purpose: What auto-pr does (bulk repository updates via automated PRs)
• Users: Platform engineers, DevProd teams, security teams applying changes at scale
• Recent Development: Last 10 commits covering security fixes, dependency updates, custom repos directory feature, and migration to uv build system
• Architecture: Core modules, workflow, configuration structure
• Development Setup: Using uv for dependency management

Context

Based on analysis of:

• Recent 42 commits pulled from master
• README.md and module structure
• Key features like environment variable expansion and custom repos directory support
• Migration from Poetry to uv for builds

Generated with Claude Code