fix: normalize session lock path

src/agents/session-write-lock.test.ts

@@ -0,0 +1,34 @@
+import fs from "node:fs/promises";
+import os from "node:os";
+import path from "node:path";
+import { describe, expect, it } from "vitest";
+
+import { acquireSessionWriteLock } from "./session-write-lock.js";
+
+describe("acquireSessionWriteLock", () => {
+  it("reuses locks across symlinked session paths", async () => {
+    if (process.platform === "win32") {
+      expect(true).toBe(true);
+      return;
+    }
+
+    const root = await fs.mkdtemp(path.join(os.tmpdir(), "clawdbot-lock-"));
+    try {
+      const realDir = path.join(root, "real");
+      const linkDir = path.join(root, "link");
+      await fs.mkdir(realDir, { recursive: true });
+      await fs.symlink(realDir, linkDir);
+
+      const sessionReal = path.join(realDir, "sessions.json");
+      const sessionLink = path.join(linkDir, "sessions.json");
+
+      const lockA = await acquireSessionWriteLock({ sessionFile: sessionReal, timeoutMs: 500 });
+      const lockB = await acquireSessionWriteLock({ sessionFile: sessionLink, timeoutMs: 500 });
+
+      await lockB.release();
+      await lockA.release();
+    } finally {
+      await fs.rm(root, { recursive: true, force: true });
+    }
+  });
+});