fix: use Stdio::inherit for run_tests to prevent pipe deadlock

spawn() with piped stdout/stderr deadlocks when the test binary
produces more output than the OS pipe buffer (64KB). Switch to
Stdio::inherit so test output flows to server logs and we can
see what's happening.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

server/src/http/mcp/shell_tools.rs

@@ -411,8 +411,8 @@ pub(super) async fn tool_run_tests(args: &Value, ctx: &AppContext) -> Result<Str
     let child = std::process::Command::new("bash")
         .arg(&script_path)
         .current_dir(&working_dir)
-        .stdout(std::process::Stdio::piped())
-        .stderr(std::process::Stdio::piped())
+        .stdout(std::process::Stdio::inherit())
+        .stderr(std::process::Stdio::inherit())
         .spawn()
         .map_err(|e| format!("Failed to spawn test script: {e}"))?;