v2.9.1: Windows build restored

Patch release that restores the Windows build after v2.9.0's release pipeline failed on both Windows targets. macOS and Linux behavior is unchanged; this release exists primarily so Windows users get binaries again.

Fixed

• Windows compile restored -- v2.9.0 introduced two Unix-only code paths without cfg gating: the new supervisor::pty module (which uses std::os::fd, unavailable on Windows) and libc::SIG* references in StopSignal (where libc is gated to cfg(unix) in Cargo.toml). The PTY module is now cfg(unix)-gated, and StopSignal uses libc constants on Unix and POSIX-typical hardcoded values on Windows for parsing/Display. Windows process termination still goes through TerminateProcess via sysinfo and ignores stop_signal, so behavior is unchanged. (#410) - @jdx

• Windows CI job -- Added a windows-build job that runs cargo check --lib --bins --all-features on windows-latest for every PR, so future Windows-only compile breakage surfaces in PR CI instead of the release pipeline. Integration tests under tests/ rely on lsof/pkill and remain Unix-only. (#410) - @jdx

Full Changelog: v2.9.0...v2.9.1

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