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Windows: example builds flake on uucode_build_tables.exe spawn (FileNotFound) #495

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@deblasis

Surfaced while verifying #88. Building the libghostty examples, 4 of 5 (cpp-vt-stream, zig-formatter, zig-vt-stream, c-vt-static) fail during pure-Zig table codegen with:

failed to spawn and capture stdio from …uucode_build_tables.exe: FileNotFound

This happens BEFORE any C++ compilation and is independent of #88's C++-header issue (now fixed) — zig-vt exercises the same SIMD C++ chain and builds clean (EXIT=0). It's the classic Windows file-lock/AV race spawning a freshly-built native helper exe.

Likely fix: Defender exclusion for the build cache dir, or a retry/poll around the uucode_build_tables codegen spawn. Low priority unless reliable example builds in CI matter.

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