Revert "fix: prevent orphaned gateway processes on Windows causing port conflcts and UI freeze (#570)"

This reverts commit 2dc1070213.

electron/gateway/supervisor.ts

@@ -32,38 +32,20 @@ export async function terminateOwnedGatewayProcess(child: Electron.UtilityProces
 
     const pid = child.pid;
     logger.info(`Sending kill to Gateway process (pid=${pid ?? 'unknown'})`);
-
-    // On Windows, use taskkill /F /T to kill the entire process tree.
-    // child.kill() only terminates the direct utilityProcess; grandchild
-    // processes (Python/uv) survive and keep port 18789 occupied.
-    if (process.platform === 'win32' && pid) {
-      import('child_process').then((cp) => {
-        cp.exec(`taskkill /F /PID ${pid} /T`, { timeout: 5000, windowsHide: true }, () => {
-          // best-effort; fall through to timeout if taskkill fails
-        });
-      }).catch(() => { /* ignore */ });
-    } else {
-      try {
-        child.kill();
-      } catch {
-        // ignore if already exited
-      }
+    try {
+      child.kill();
+    } catch {
+      // ignore if already exited
     }
 
     const timeout = setTimeout(() => {
       if (!exited) {
         logger.warn(`Gateway did not exit in time, force-killing (pid=${pid ?? 'unknown'})`);
         if (pid) {
-          if (process.platform === 'win32') {
-            import('child_process').then((cp) => {
-              cp.exec(`taskkill /F /PID ${pid} /T`, { timeout: 5000, windowsHide: true }, () => {});
-            }).catch(() => {});
-          } else {
-            try {
-              process.kill(pid, 'SIGKILL');
-            } catch {
-              // ignore
-            }
+          try {
+            process.kill(pid, 'SIGKILL');
+          } catch {
+            // ignore
           }
         }
       }
@@ -244,9 +226,6 @@ export async function findExistingGatewayProcess(options: {
       const pids = await getListeningProcessIds(port);
       if (pids.length > 0 && (!ownedPid || !pids.includes(String(ownedPid)))) {
         await terminateOrphanedProcessIds(port, pids);
-        // Verify the port is actually free after killing orphans.
-        // On Windows, TCP TIME_WAIT can hold the port for up to 120s.
-        await waitForPortFree(port, 10000);
         return null;
       }
     } catch (err) {