Strip .planning/ from staging before merge commits when commit_docs is
false. Prevents planning files from being committed during milestone
completion even when using branching strategies.
- Add commit_docs to config extraction in handle_branches step
- Reset .planning/ from staging before squash merge commits
- Use --no-commit flag for --no-ff merges to allow reset before commit
- Document branch merge behavior in planning-config.md
Closes#608
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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