First real execution of soak-conpty.ps1 on GitHub's windows-latest proved the
harness works — it spawned real ConPTY children, ran the suite (6 tests), and
measured the first iteration — then died printing the per-iter line: `{3,+4}`
is a printf-ism, not valid .NET composite formatting (the `+` is rejected with
"Expected an ASCII digit"). The script had never run on Windows before, so the
typo was latent. Drop to `{3,4}` (plain width).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Verification tooling for the Windows freeze assessment (T-424).
provision-vm.sh stands up a Windows KVM guest (dry-run unless --go);
bootstrap-windows.ps1 installs Flutter + VS C++ Build Tools and checks out
the branch; soak-conpty.ps1 runs the pty suite in a fresh dart.exe per
iteration and measures the orphaned conhost/cmd count that survives each
exit (the leak signature), with a per-iteration timeout so a wedged test
can't stall the run. Verifies the ConPTY leak (#1-#4); the GPU/TDR
hypothesis (#5) needs passthrough/bare metal (README appendix).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
jpmschweitzerandClaude Opus 4.8