test: add getToolInfo() return shape contract test

Verifies that the ToolInfo type and getToolInfo() function exported from
message-part.tsx still have the icon and title fields that
VscodeSessionTurn depends on.

Ref: testing-gaps-and-visual-testing-plan.md §1.3

packages/kilo-vscode/tests/unit/tool-info-contract.test.ts

@@ -0,0 +1,35 @@
+/**
+ * getToolInfo() return shape contract test.
+ *
+ * VscodeSessionTurn calls getToolInfo() from @kilocode/kilo-ui/message-part
+ * and relies on the returned ToolInfo having `icon` and `title` fields.
+ *
+ * This test verifies that the ToolInfo type exported from message-part.tsx
+ * still declares those fields. If upstream changes the shape, this will fail.
+ */
+
+import { describe, it, expect } from "bun:test"
+import fs from "node:fs"
+import path from "node:path"
+
+const MONOREPO_ROOT = path.resolve(import.meta.dir, "../../../..")
+const MESSAGE_PART_FILE = path.join(MONOREPO_ROOT, "packages/ui/src/components/message-part.tsx")
+
+describe("getToolInfo() return shape contract", () => {
+  it("getToolInfo still exports expected shape fields", () => {
+    const src = fs.readFileSync(MESSAGE_PART_FILE, "utf-8")
+    // ToolInfo type must still have these fields
+    expect(src).toMatch(/icon\s*:/)
+    expect(src).toMatch(/title\s*:/)
+  })
+
+  it("getToolInfo function is exported", () => {
+    const src = fs.readFileSync(MESSAGE_PART_FILE, "utf-8")
+    expect(src).toContain("export function getToolInfo")
+  })
+
+  it("ToolInfo type is exported", () => {
+    const src = fs.readFileSync(MESSAGE_PART_FILE, "utf-8")
+    expect(src).toContain("export type ToolInfo")
+  })
+})