Enable Windows libxev poller path

[heartwilltell]

Summary

• enable the libxev Windows IOCP path in the runtime bridge by converting CRT fds to Windows handles and using one-shot overlapped completions for read/write readiness
• install the Windows runxev bridge as a Zig-built static library instead of trying to archive COFF objects with host ar
• add Windows named-pipe poller smoke coverage and remove the legacy poller's silent unsupported-platform stub

Fixes #407

Dependency

• Depends on Port scheduler to Windows (threads, TLS, timers) #406 / PR Add runtime platform thread primitives #440 for the scheduler/platform Windows compile fixes. This branch is based on origin/main, so the Windows target still stops in the known scheduler/runtime Windows gaps after the xev bridge object compiles.

Validation

• zig fmt build.zig src/runtime/run_xev_bridge.zig
• clang-format -i src/runtime/tests/test_poller.c src/runtime/run_poller_legacy.c
• zig build
• zig build test (passes; emits the expected bad_check.run missing-symbol diagnostic)
• zig build test-runtime (82/82)
• zig build -Dtarget=x86_64-windows-gnu (expected failure in Port scheduler to Windows (threads, TLS, timers) #406-owned scheduler/platform symbols: __declspec(align), sysconf, DWORD_PTR, SetThreadAffinityMask; no libxev bridge File.initFd or COFF archive failure remains)

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	runlang	4573a46	Commit Preview URL Branch Preview URL	Apr 26 2026, 09:52 PM