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Two-phase GPU thermal cycling test with per-second telemetry: - Phases: baseline → load1 → pause (no cooldown) → load2 → cooldown - Monitors: fan RPM (ipmitool sdr), CPU/server temps (ipmitool/sensors), system power (ipmitool dcmi), GPU temp/power/usage/clock/throttle (nvidia-smi) - Detects throttling via clocks_throttle_reasons.active bitmask - Measures fan response lag from load start (validates case-04 ~2s lag) - Exports metrics.csv (wide format, one row/sec) and fan-sensors.csv (long format) - TUI: adds [F] Fan Stress Test to Health Check screen with Quick/Standard/Express modes Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>