fix: avoid systemd-supervised gateway retry loop in owned launcher (#700)

tests/unit/config-sync.test.ts

@@ -0,0 +1,45 @@
+import { describe, expect, it } from 'vitest';
+import { stripSystemdSupervisorEnv } from '@electron/gateway/config-sync-env';
+
+describe('stripSystemdSupervisorEnv', () => {
+  it('removes systemd supervisor marker env vars', () => {
+    const env = {
+      PATH: '/usr/bin:/bin',
+      OPENCLAW_SYSTEMD_UNIT: 'openclaw-gateway.service',
+      INVOCATION_ID: 'abc123',
+      SYSTEMD_EXEC_PID: '777',
+      JOURNAL_STREAM: '8:12345',
+      OTHER: 'keep-me',
+    };
+
+    const result = stripSystemdSupervisorEnv(env);
+
+    expect(result).toEqual({
+      PATH: '/usr/bin:/bin',
+      OTHER: 'keep-me',
+    });
+  });
+
+  it('keeps unrelated variables unchanged', () => {
+    const env = {
+      NODE_ENV: 'production',
+      OPENCLAW_GATEWAY_TOKEN: 'token',
+      CLAWDBOT_SKIP_CHANNELS: '0',
+    };
+
+    expect(stripSystemdSupervisorEnv(env)).toEqual(env);
+  });
+
+  it('does not mutate source env object', () => {
+    const env = {
+      OPENCLAW_SYSTEMD_UNIT: 'openclaw-gateway.service',
+      VALUE: '1',
+    };
+    const before = { ...env };
+
+    const result = stripSystemdSupervisorEnv(env);
+
+    expect(env).toEqual(before);
+    expect(result).toEqual({ VALUE: '1' });
+  });
+});