fix: make workspace registry lock process-bound

backend/test/workspace-registry.test.ts

@@ -6,6 +6,7 @@ import { tmpdir } from "node:os";
 import { join } from "node:path";
 import { promisify } from "node:util";
 import { afterEach, expect, test } from "vitest";
+import { WorkspaceRepositoryLock } from "../src/workspaces/git-repository.js";
 import { WorkspaceRegistry } from "../src/workspaces/registry.js";
 import type { WorkspaceRegistryConfig } from "../src/workspaces/types.js";
 
@@ -113,14 +114,25 @@ test("keeps the last valid snapshot when a pulled commit has invalid YAML", asyn
   });
 });
 
-test("does not bypass an existing advisory repository lock", async () => {
+test("does not bypass an existing live advisory repository lock", async () => {
   const remote = await fixture();
   const root = join(remote.root, "registry");
   const registry = new WorkspaceRegistry(config(root, remote.remote));
-  mkdirSync(join(root, "locks"), { recursive: true });
-  writeFileSync(join(root, "locks", "repository.lock"), "held");
+  const lock = new WorkspaceRepositoryLock(join(root, "locks"));
+  let release!: () => void;
+  let started!: () => void;
+  const held = lock.run(async () => {
+    started();
+    await new Promise<void>((resolve) => { release = resolve; });
+  });
+  await new Promise<void>((resolve) => { started = resolve; });
 
-  await expect(registry.bootstrap()).rejects.toMatchObject({ code: "workspace_stale" });
+  try {
+    await expect(registry.bootstrap()).rejects.toMatchObject({ code: "workspace_stale" });
+  } finally {
+    release();
+    await held;
+  }
 });
 
 test("rejects a symbolic-link registry root before creating a lock below it", async () => {