fix: prevent crashes when output is piped

src/main.rs

@@ -1356,6 +1356,17 @@ fn validate_pnpm_filters(filters: &[String], command: &PnpmCommands) -> Option<S
 }
 
 fn main() {
+    // Reset SIGPIPE to default handler so writing to a closed pipe
+    // e.g `rtk git log | head` exits silently instead of panicking.
+    // Rust ignores SIGPIPE by default and with panic="abort" in the
+    // release profile that becomes SIGABRT + coredump.
+    #[cfg(unix)]
+    #[allow(unsafe_code)]
+    // nosemgrep: unsafe-block
+    unsafe {
+        libc::signal(libc::SIGPIPE, libc::SIG_DFL);
+    }
+
     let code = match run_cli() {
         Ok(code) => code,
         Err(e) => {
@@ -3153,6 +3164,40 @@ mod tests {
         }
     }
 
+    #[test]
+    #[ignore] // Integration test: requires `cargo build` first
+    fn test_broken_pipe_does_not_crash() {
+        let bin_path = std::path::PathBuf::from(env!("CARGO_MANIFEST_DIR"))
+            .join("target")
+            .join("debug")
+            .join("rtk");
+        assert!(
+            bin_path.exists(),
+            "Debug binary not found at {:?} - run `cargo build` first",
+            bin_path
+        );
+
+        let mut child = std::process::Command::new(&bin_path)
+            .args(["git", "log", "--oneline", "-50"])
+            .stdout(std::process::Stdio::piped())
+            .stderr(std::process::Stdio::piped())
+            .spawn()
+            .expect("Failed to spawn rtk");
+
+        // Read one byte then drop stdout to close the pipe.
+        let mut stdout = child.stdout.take().unwrap();
+        let mut buf = [0u8; 1];
+        let _ = std::io::Read::read(&mut stdout, &mut buf);
+
+        let status = child.wait().expect("Failed to wait for rtk");
+        let code = status.code().unwrap_or(-1);
+
+        assert_ne!(
+            code, 134,
+            "rtk crashed with SIGABRT (exit 134) on broken pipe - SIGPIPE handler missing"
+        );
+    }
+
     #[test]
     fn test_ultra_compact_long_form_still_works() {
         let cli = Cli::try_parse_from(["rtk", "--ultra-compact", "git", "status"]).unwrap();