Two post-reboot runs: the first reproduced the failure identically (smoke 1s
pass, suite 3s fail), the second failed earlier at `dotnet restore` in 0s — a
step that succeeded in 3-4s on every previous run, same commit, same runner.
That rules out stuck state (reboot changed nothing) and rules out a
deterministic sandbox policy such as seccomp/W^X blocking runtime IL emission,
which was the leading remaining hypothesis. Combined with host telemetry
showing no disk/memory/PID pressure, confidence in any specific mechanism drops
to ~25%; confidence that application code is not the cause stays high.
Removes the pure-vs-Moq diagnostic scaffolding (it never executed). No test
skipped or weakened.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
cesnimda
3b59152782