feat: configurable status lines for CLI footer (#904)

Co-authored-by: Letta <noreply@letta.com>

src/tests/cli/statusline-schema.test.ts

@@ -0,0 +1,21 @@
+import { describe, expect, test } from "bun:test";
+import {
+  STATUSLINE_DERIVED_FIELDS,
+  STATUSLINE_NATIVE_FIELDS,
+} from "../../cli/helpers/statusLineSchema";
+
+describe("statusLineSchema", () => {
+  test("contains native and derived fields", () => {
+    expect(STATUSLINE_NATIVE_FIELDS.length).toBeGreaterThan(0);
+    expect(STATUSLINE_DERIVED_FIELDS.length).toBeGreaterThan(0);
+  });
+
+  test("field paths are unique", () => {
+    const allPaths = [
+      ...STATUSLINE_NATIVE_FIELDS,
+      ...STATUSLINE_DERIVED_FIELDS,
+    ].map((f) => f.path);
+    const unique = new Set(allPaths);
+    expect(unique.size).toBe(allPaths.length);
+  });
+});