Address review feedback on the time-boxed runtime probes:
- GNU timeout exits 137, not 124, when -k escalates to SIGKILL. Run it
with --verbose and report a timeout for 124, or for 137 only when
timeout announced its own KILL, so an app killed by something else is
not misreported. Verified against coreutils 9.4 on ubuntu:24.04.
- Print the first and last 16 KiB of oversized Flatpak probe output so
a late startup exception or the timeout notice stays in the log.
- Pin the hostile Snap probe's timeout-before-generic-failure ordering.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>