fix: handle Windows and UNC bind mount parsing

src/agents/sandbox/fs-paths.test.ts

@@ -1,12 +1,12 @@
 import path from "node:path";
 import { describe, expect, it } from "vitest";
+import type { SandboxContext } from "./types.js";
 import {
   buildSandboxFsMounts,
   parseSandboxBindMount,
   resolveSandboxFsPathWithMounts,
 } from "./fs-paths.js";
 import { createSandboxTestContext } from "./test-fixtures.js";
-import type { SandboxContext } from "./types.js";
 
 function createSandbox(overrides?: Partial<SandboxContext>): SandboxContext {
   return createSandboxTestContext({ overrides });
@@ -38,6 +38,14 @@ describe("parseSandboxBindMount", () => {
       writable: true,
     });
   });
+
+  it("parses UNC-style host paths", () => {
+    expect(parseSandboxBindMount("//server/share:/workspace:ro")).toEqual({
+      hostRoot: path.resolve("//server/share"),
+      containerRoot: "/workspace",
+      writable: false,
+    });
+  });
 });
 
 describe("resolveSandboxFsPathWithMounts", () => {