Carries forward the choo-devtools 3.x essentials: live state handle, emit-from-console, event log, nanotiming measures via PerformanceObserver, state copy(), help(). No-op on the server; verbose logging opt-in via localStorage.CHOO_DEVTOOLS_VERBOSE. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_014NgfSjHE11oFpoSnLVKLXd