fix(audio): use file I/O by default on Windows

libsndfile reads stdin via Win32 API (GetStdHandle/ReadFile) rather than
the CRT, making pipe I/O unreliable on Windows regardless of _setmode.
Default to file I/O on Windows; AWMKIT_DISABLE_PIPE_IO still works as
an override on all platforms.

Also revert CI to stable audiowmark-win-2026-02-03 release.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: 2 people

.github/workflows/windows-winui.yml

@@ -24,7 +24,7 @@ permissions:
   contents: read
 
 env:
-  AUDIOWMARK_WINDOWS_RELEASE: audiowmark-win-2026-02-19-binary-mode-fix
+  AUDIOWMARK_WINDOWS_RELEASE: audiowmark-win-2026-02-03
   AUDIOWMARK_WINDOWS_ASSET: audiowmark-windows-x86_64.zip
   AUDIOWMARK_MACOS_RELEASE: audiowmark-macos-arm64-2026-02-03
   AUDIOWMARK_MACOS_ASSET: audiowmark-macos-arm64.tar.gz

src/audio.rs

@@ -1950,10 +1950,15 @@ fn effective_awmiomode() -> AwmIoMode {
         .ok()
         .is_some_and(|value| parse_env_flag(&value))
     {
-        AwmIoMode::File
-    } else {
-        AwmIoMode::Pipe
+        return AwmIoMode::File;
     }
+    // On Windows, libsndfile reads stdin via Win32 API (GetStdHandle/ReadFile)
+    // rather than the CRT, making pipe I/O unreliable regardless of _setmode.
+    // Use file I/O by default on Windows.
+    if cfg!(target_os = "windows") {
+        return AwmIoMode::File;
+    }
+    AwmIoMode::Pipe
 }
 
 /// Internal helper function.
@@ -3121,6 +3126,9 @@ mod tests {
     #[test]
     fn test_effective_awmiomode_respects_env() {
         with_disable_pipe_env(None, || {
+            #[cfg(target_os = "windows")]
+            assert_eq!(effective_awmiomode(), AwmIoMode::File);
+            #[cfg(not(target_os = "windows"))]
             assert_eq!(effective_awmiomode(), AwmIoMode::Pipe);
         });
         with_disable_pipe_env(Some("1"), || {