fix(test): serialize changed checks locally

test/scripts/changed-lanes.test.ts

@@ -5,6 +5,7 @@ import { afterEach, describe, expect, it } from "vitest";
 import { detectChangedLanes } from "../../scripts/changed-lanes.mjs";
 import {
   CHANGED_CHECK_VITEST_NO_OUTPUT_TIMEOUT_MS,
+  createChangedCheckChildEnv,
   createChangedCheckPlan,
   createChangedCheckVitestEnv,
 } from "../../scripts/check-changed.mjs";
@@ -112,6 +113,15 @@ describe("scripts/changed-lanes", () => {
     });
   });
 
+  it("marks changed-check children as covered by the parent heavy-check lock", () => {
+    expect(createChangedCheckChildEnv({ PATH: "/usr/bin" })).toMatchObject({
+      OPENCLAW_OXLINT_SKIP_LOCK: "1",
+      OPENCLAW_TEST_HEAVY_CHECK_LOCK_HELD: "1",
+      OPENCLAW_TSGO_HEAVY_CHECK_LOCK_HELD: "1",
+      PATH: "/usr/bin",
+    });
+  });
+
   it("routes core test-only changes to core test lanes only", () => {
     const result = detectChangedLanes(["src/shared/string-normalization.test.ts"]);
 

test/scripts/test-projects.test.ts

@@ -527,6 +527,24 @@ describe("scripts/test-projects local heavy-check lock", () => {
     ).toBe(true);
   });
 
+  it("skips the lock when a parent changed gate already holds it", () => {
+    expect(
+      shouldAcquireLocalHeavyCheckLock(
+        [
+          {
+            config: "test/vitest/vitest.unit.config.ts",
+            includePatterns: ["src/infra/vitest-config.test.ts"],
+            watchMode: false,
+          },
+        ],
+        {
+          ...process.env,
+          OPENCLAW_TEST_HEAVY_CHECK_LOCK_HELD: "1",
+        },
+      ),
+    ).toBe(false);
+  });
+
   it("allows forcing the lock back on", () => {
     expect(
       shouldAcquireLocalHeavyCheckLock(