[Rovey]

What changes

• Ctrl+C during the measurement at stock stops the run and puts the tune back. measure_stock did not register the emergency handlers, so Ctrl+C on the command line ended gao there: the tune the run found on the card was not put back, and a running tray app took the stock it left for a driver reset.
• The put-back after a stopped run gets no run.log header of its own, so the log no longer reads as if a new run started.
• Test: a gao.json written by 0.4.2 keeps its tune and applies at logon. Everyone on 0.4.2 (the latest release) will be offered 0.4.8; a Best and an All in one profile in 0.4.2's exact format load whole and pass decide_boot.
• README: what the RTX 5070 showed about the desktop after a driver reset, gao --stress --duty, and the dashboard's comparison with stock.
• Hardware checks 30, 31, 34, 37, 38, 39, 42, 43, 44, 47 and 56 filled in from the release checks of 2026-10-18 on the reference RTX 4070, or pointed at the later checks that covered them.

Checked

• Release build, all tests and ASan green.
• On the reference RTX 4070 (driver 617.42), elevated, with the installed 0.4.8-rc8 and a build of this branch:
  • Ctrl+C 10 s into the measurement at stock: the run ended in 1.2 s, the saved tune was back, fans driver control, journal ABORTED.
  • Check 43: gao --fan auto under load, the tray put its curve back within 45 s.
  • Check 34: an outside core offset (gao --set-core 30); the watchdog logged that another program changed the settings and left them alone.
  • Check 37: the close button hides the window to the tray.
  • Check 47: Abort a minute into the soak of a Best of my GPU run from the window: aborted within a second, journal ABORTED, the saved tune back on the card, no watchdog line after it.
• Not run: check 42 (no program here sets the fans by hand).

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