fix(client): use powershell -NoProfile as executor to prevent $PROFILE clear

crates/client/src/shell.rs

@@ -1,6 +1,6 @@
 /// Shell execution — each command runs in its own fresh process.
-/// No persistent state, no sentinel logic, no encoding tricks.
-/// stdout/stderr are captured as raw bytes and decoded with from_utf8_lossy.
+/// On Windows we use powershell.exe -NoProfile so the user's $PROFILE
+/// (which might run `clear`) is never loaded.
 use std::time::Duration;
 use tokio::process::Command;
 
@@ -14,10 +14,11 @@ impl PersistentShell {
     pub async fn run(&mut self, command: &str) -> Result<(String, String, i32), String> {
         #[cfg(windows)]
         {
-            // /D = skip AutoRun registry (no user `clear` hooks)
-            // /C = run command and exit
-            let mut cmd = Command::new("cmd.exe");
-            cmd.args(["/D", "/C", command]);
+            // -NoProfile: skip $PROFILE (prevents user's `clear` from running)
+            // -NonInteractive: no prompts
+            // -Command: run the given command string
+            let mut cmd = Command::new("powershell.exe");
+            cmd.args(["-NoProfile", "-NonInteractive", "-Command", command]);
             run_captured(cmd, Duration::from_millis(TIMEOUT_MS)).await
         }
         #[cfg(not(windows))]