feat: judge each probe run with a boot oracle

core_probe writes record version 4. Each run is boots, bios_error, crash, hang or unknown, from reference frames, core error patterns and screens, and the process status. A crash or a timeout is a verdict now, rebuilt from the events the worker streamed. --vary accepts @zeros:SIZE and @head:SIZE:PATH, and run takes --repeat.

scripts/measurement_records.py

@@ -27,7 +27,7 @@ from collections.abc import Iterable
 from dataclasses import dataclass
 from pathlib import Path
 
-RECORD_VERSION = 3
+RECORD_VERSION = 4
 # 3: before the boot oracle. 4: every repetition and variant carries a verdict.
 RECORD_VERSIONS = (3, 4)
 RECORDS_DIR = "measurements"