docs: update WEBSOCKET_API.md with complete API reference
- Add Workspace Actions section (workspace.list, create, get, update, delete)
- Add Repository Actions section (repository.*, repository.script.*)
- Add Comment Actions section (comment.add, comment.list)
- Add Permission Actions section (permission.requested, permission.respond)
- Add comment.added notification documentation
- Update Quick Reference table with all actions organized by category
- Document all notification actions (ACP, task, workspace, board, column events)
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