Add external_ref field to CreateArgs and UpdateArgs RPC protocol
structs to enable linking issues to external systems (GitHub, Jira,
Shortcut, etc.) when using daemon mode.
Changes:
- Add ExternalRef field to rpc.CreateArgs and rpc.UpdateArgs
- Update bd create/update commands to pass external_ref via RPC
- Update daemon handlers to process external_ref field
- Add integration tests for create and update operations
The --external-ref flag now works correctly in both daemon and direct modes.
Fixes https://github.com/steveyegge/beads/issues/303
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Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: Happy <yesreply@happy.engineering>
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