feat(core): recover truncated tool output via the Session scratchpad (#145)

Co-authored-by: Yaowei Zheng <hiyouga@buaa.edu.cn>
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

packages/core/test/model-visible-path.test.ts

@@ -0,0 +1,22 @@
+import { describe, expect, it } from "vitest";
+import { modelVisiblePath } from "../src/internal/model-visible-path.js";
+
+describe("modelVisiblePath", () => {
+  it.skipIf(process.platform === "win32")(
+    "passes POSIX paths through, including backslash filename characters",
+    () => {
+      expect(modelVisiblePath("/tmp/a path/report.log")).toBe("/tmp/a path/report.log");
+      expect(modelVisiblePath("/tmp/we\\ird.log")).toBe("/tmp/we\\ird.log");
+    },
+  );
+
+  it.skipIf(process.platform !== "win32")(
+    "spells ordinary Windows and UNC paths with forward slashes",
+    () => {
+      expect(modelVisiblePath("C:\\Users\\x\\a path\\report.log")).toBe(
+        "C:/Users/x/a path/report.log",
+      );
+      expect(modelVisiblePath("\\\\server\\share\\report.log")).toBe("//server/share/report.log");
+    },
+  );
+});