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Toolbox is still being refined; hide it from clients on prod while keeping it usable on staging. Entry points (header link, dashboard card) render only when TOOLBOX_VISIBLE=true; a tools/layout redirects /tools/* to /dashboard otherwise. Routes and ToolUsage table are untouched (no destructive migration). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>