Windows/Wine test harness (Track T)

• Type: feature (Track T — tools & testing infra). Enables [[feature-port-windows-pe]].
• Status: backlog
• Owner: —
• Opened: 2026-07-17, OS-portability mapping session. Context: devdocs/dev/portability-axes.md, umbrella [[feature-port-multi-os-abstraction]].

Why

Windows PE output is testable on Linux with no VM — Wine runs user-mode PE hitting kernel32/ntdll faithfully. This ticket stands up that test bed ahead of the PE writer so verification is one command when the writer lands (same pattern as the FreeBSD linuxulator smoke). T owns the tool; a compiler gap it surfaces is filed to the owning lane, never fixed here.

Deliverables

1. Wine runner — a run_wine.sh-style wrapper (analogue of run_target.sh): wine64 out.exe, capture stdout + exit code, WINEDEBUG=-all to silence, a scratch WINEPREFIX (never ~/.wine), xvfb-run wrap (testmgr already models the xvfb resource, so free). Deterministic, headless.
2. mingw-w64 differential oracle — x86_64-w64-mingw32-gcc as a second Windows compiler on Linux. Two uses: (a) validate the wine setup itself (mingw hello → wine → green) so "wine broken" is never confused with "pxx PE broken"; (b) differential oracle for pxx PE output — compile the same program with mingw→PE and pxx→PE, run both under wine, diff. Mirrors gcc-for-C-corpus / FPC-for-pasmith.
3. Green gate — a hello-world (mingw-built) runs under the runner and prints the expected line; wired so testmgr can invoke it as a qemu-class-style job once pxx PE binaries exist.

Dependencies (host packages — user installs)

• wine64 (or the wine metapackage on newer Debian/Ubuntu).
• gcc-mingw-w64-x86-64.
• xvfb — already present.

Install line (user-run): sudo apt install -y wine64 gcc-mingw-w64-x86-64.

Acceptance

• run_wine.sh <exe> runs a PE headless, returns its stdout + exit code deterministically.
• mingw hello-world → wine → prints expected output (setup validated).
• Differential mode: mingw-PE vs (later) pxx-PE checksum diff, ready to wire into the Windows bring-up.
• Gate for this tooling change: tools/testmgr.py --tier full green (test with quick tiers + a scratch prefix, never long runs).

Note

Stands alone — needs no compiler change. Build it whenever; it just waits for [[feature-port-windows-pe]] to produce a PE to point at.