183ded4096
Implements --resolve-collisions flag for import command to safely handle ID collisions during branch merges. When enabled, colliding issues are remapped to new IDs and all text references and dependencies are automatically updated. Also adds comprehensive tests, branch-merge example, and documentation. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>