Generate pull request descriptions

Generate PR description from commit history

Auto-generating comprehensive PR descriptions that summarize commit history and affected components.

• · markdown PR description
• · linked to recent commits
• · assessment of affected areas

• · git log/diff

• · git repo with origin remote
• · commits on feature branch vs main

• · No commits on branch → warn empty PR
• · Large diff → summarize by file groups
• · Missing context → provide template for manual editing

• · Generated from git history (single source of truth)
• · Affected files parsed from diff stat
• · Test plan checklist provided
• · Breaking changes explicitly called out