more hostenv isolation#7886

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Commits on May 16, 2026

Convert host_env Windows path/argv params from raw *const u16 to &WideCStr
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Migrate remaining winapi raw u16 pointer signatures to typed references
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Migrate winreg pub unsafe fn string parameters to typed references
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Add ToPyException impls for host_env error types (PyPy wrap_oserror analog)
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Add CheckLibcResult helper and apply to socket/fcntl/shm/posix_wasi
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Add Win32 BOOL/HANDLE check helpers; apply check helpers across host_env
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Apply Win32/libc check helpers to overlapped/testconsole/os.rs
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Apply Win32 check helpers to winapi.rs (partial)
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Apply Win32 check helpers across more winapi.rs functions
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Apply Win32 check helpers to nt.rs (partial)
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