Implement session deletion functionality across all agent implementations (claudecode, codex, cursor, gemini)
Add new /delete command with session lookup by ID/prefix
Add i18n support for delete-related messages
Update command help texts to include new delete command
Add SessionDeleter interface for agents supporting deletion
Implement core deletion logic with active session protection
generated by llmgit
Co-Authored-By: Claude <noreply@anthropic.com>
