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Records README CONCEPTS table updates for Subagents (CLAUDE_CODE_FORK_SUBAGENT), Hooks (updatedToolOutput), MCP Servers (alwaysLoad), Settings (Auto Mode Config inline link), and Ultrareview (claude ultrareview subcommand). The recurring /slash-commands stale URL claim remains INVALID per long-standing user decision. Co-Authored-By: Claude <noreply@anthropic.com>