chore: document error handling fallbacks

Co-authored-by: fuxingloh <4266087+fuxingloh@users.noreply.github.com>

Author: Copilot

packages/use-agently/src/bin.ts

@@ -12,7 +12,7 @@ function resolveOutputFormat(): "tui" | "json" {
   try {
     return getOutputFormat(cli);
   } catch {
-    // Fallback for unexpected failures before Commander parses options.
+    // If option parsing fails, still show the underlying CLI error without double-logging here.
     return "tui";
   }
 }

packages/use-agently/src/errors.test.ts

@@ -9,6 +9,7 @@ describe("handleCliError", () => {
   beforeEach(() => {
     originalIsTTY = process.stderr.isTTY;
     exitSpy = spyOn(process, "exit").mockImplementation((code?: number) => {
+      // Bubble a sentinel error so tests can assert the exit while preventing the process from terminating.
       throw new Error("process.exit");
     });
     errorSpy = spyOn(console, "error").mockImplementation(() => {});