Create PR Summary

Generate a pull request summary based on branch changes.

Instructions

Gather Context
- Get current branch name
- Find the corresponding .ai/ workflow folder for this branch:
  - For issue branches (e.g., feature/59-no-verify): look for .ai/issue-59-*
  - For named branches (e.g., feature/worktree-support): look for .ai/feature-worktree-support/ or .ai/worktree-support/
  - Use ls .ai/ and match based on branch name patterns
- Read these files if they exist (use them to understand the feature goals and implementation approach):
  - concept.md - Feature concept and design rationale
  - analysis.md - Issue analysis and requirements
  - plan.md - Implementation plan with specific changes
- Get associated issue number from branch name, commits, or analysis.md