Subagent orchestration grows with permissionMode, SubagentStart hook, tool_use_id in hook inputs, and skills frontmatter; four UI and tool fixes included.
permissionMode field for custom agentstool_use_id field to PreToolUseHookInput and PostToolUseHookInput typesSubagentStart hook eventCLAUDE.md files not loading when @-mentioning filescell-N