Added actor field to RPC client and set it before daemon requests.
This ensures status changes (like pinned events) show who performed
the action in bd activity output.
Changes:
- Added actor field to Client struct
- Added SetActor method to set actor for audit trail
- Modified ExecuteWithCwd to include actor in RPC requests
- Updated main.go to call SetActor after daemon connection
Fixes gt-1ydd9
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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