fix: agents-create.test.ts hangs because of awaiting input

[khendrikse]

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Summary

This should help unblock the tests that were failing all over the place 🙏

1. Fixed the hanging test issue - The original problem was that callCli spawns a subprocess that can't
   inherit inquirer mocks, causing tests to hang waiting for user input
2. Converted tests to use execa directly - This gives us proper control over subprocess stdin/stdout
3. Used handleQuestions for interactive tests - This allows us to programmatically provide input to prompts
4. Ensured all required parameters are provided - Added --branch flags where needed to avoid unexpected
   prompts
5. Implemented the todo test - Created a proper test for interactive mode when no prompt is provided

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[github-actions]

📊 Benchmark results

Comparing with 627040e

• Dependency count: 1,031 (no change)
• Package size: 284 MB (no change)
• Number of ts-expect-error directives: 380 (no change)

[serhalp]

LGTM, thanks for fixing this!