fix(gateway): prevent reconnect race and hide windows subprocess consoles

Co-authored-by: Haze <hazeone@users.noreply.github.com>

tests/unit/gateway-process-policy.test.ts

@@ -0,0 +1,64 @@
+import { describe, expect, it } from 'vitest';
+import {
+  getReconnectSkipReason,
+  isLifecycleSuperseded,
+  nextLifecycleEpoch,
+  shouldHideConsoleWindow,
+} from '@electron/gateway/process-policy';
+
+describe('gateway process policy helpers', () => {
+  describe('shouldHideConsoleWindow', () => {
+    it('returns true on Windows', () => {
+      expect(shouldHideConsoleWindow('win32')).toBe(true);
+    });
+
+    it('returns false on non-Windows platforms', () => {
+      expect(shouldHideConsoleWindow('darwin')).toBe(false);
+      expect(shouldHideConsoleWindow('linux')).toBe(false);
+    });
+  });
+
+  describe('lifecycle epoch helpers', () => {
+    it('increments lifecycle epoch by one', () => {
+      expect(nextLifecycleEpoch(0)).toBe(1);
+      expect(nextLifecycleEpoch(5)).toBe(6);
+    });
+
+    it('detects superseded lifecycle epochs', () => {
+      expect(isLifecycleSuperseded(3, 4)).toBe(true);
+      expect(isLifecycleSuperseded(8, 8)).toBe(false);
+    });
+  });
+
+  describe('getReconnectSkipReason', () => {
+    it('skips reconnect when auto-reconnect is disabled', () => {
+      expect(
+        getReconnectSkipReason({
+          scheduledEpoch: 10,
+          currentEpoch: 10,
+          shouldReconnect: false,
+        })
+      ).toBe('auto-reconnect disabled');
+    });
+
+    it('skips stale reconnect callbacks when lifecycle epoch changed', () => {
+      expect(
+        getReconnectSkipReason({
+          scheduledEpoch: 11,
+          currentEpoch: 12,
+          shouldReconnect: true,
+        })
+      ).toContain('stale reconnect callback');
+    });
+
+    it('allows reconnect when callback is current and reconnect enabled', () => {
+      expect(
+        getReconnectSkipReason({
+          scheduledEpoch: 7,
+          currentEpoch: 7,
+          shouldReconnect: true,
+        })
+      ).toBeNull();
+    });
+  });
+});