test(refresh-lock): shrink cross-process holder hold to 600ms

Author: Gustav-Simonsson

scripts/ci-timings.json

@@ -5,7 +5,7 @@
     "scripts/test-parallel.test.ts": 2496,
     "src/plugins/shell-guard-plugin.test.ts": 1883,
     "src/tui/tool-execution-watchdog.test.ts": 1853,
-    "src/auth/codex/refresh-lock.test.ts": 1840,
+    "src/auth/codex/refresh-lock.test.ts": 930,
     "src/tui/provider-setup.test.ts": 1562,
     "src/tui/url-click.test.ts": 1442,
     "e2e/exec-signal-finalize.test.ts": 1299,

src/auth/codex/refresh-lock.test.ts

@@ -164,7 +164,10 @@ describe("codex refresh lock", () => {
       import.meta.url,
     ).pathname;
     const lock = join(dir, "refresh.lock");
-    const proc = Bun.spawn(["bun", "run", holderPath, lock, "1500"], {
+    // Hold 600ms: the parent's 300ms acquisition attempt below must run
+    // entirely while the holder still holds (2x headroom), and the parent
+    // then waits for the holder to release, so the hold is the test's floor.
+    const proc = Bun.spawn(["bun", "run", holderPath, lock, "600"], {
       stdout: "pipe",
       stderr: "pipe",
     });