Prevent user confusion when running outdated bd binaries by detecting
version mismatches between the binary and database.
Features:
- Store bd version in metadata table on init
- Check version on every command (PersistentPreRun)
- Warn if binary is outdated with rebuild instructions
- Auto-upgrade database if binary is newer
- Silent operation when versions match
Fixes confusion from bd-182 (auto-export not working with old binary)
Implements bd-197
Files changed:
- cmd/bd/init.go: Store version on init
- cmd/bd/main.go: checkVersionMismatch() + integration
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Co-Authored-By: Claude <noreply@anthropic.com>
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