/crumb-doctor — environment health check
When the user asks about environment readiness or what presets are viable:
Preferred path — call the crumb_doctor MCP tool (no args).
Fallback path — npx tsx src/index.ts doctor.
Output table: | Host | Status | Detail | for Claude Code / Codex CLI / Gemini CLI / playwright / htmlhint. Then ## Recommended preset (for the current environment) with viable / not-viable per preset.
Explicit slash form: /crumb-doctor.
Reference: src/helpers/doctor.ts, v0.1 §3 (auth-manager spec).