Root cause: metadata.json is tracked in git and contains last_bd_version.
When git operations (pull, checkout, merge) reset metadata.json to the
committed version, the upgrade notification would fire repeatedly.
Fix: Store the last used bd version in .beads/.local_version which is
gitignored, so git operations don't affect version tracking.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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