Fix: Allow --agent flag without prompt in headless mode

[continue]

Summary

Fixes an issue where using cn -p --agent owner/package incorrectly required a prompt argument, even though agent files can provide their own prompts.

Changes

• Modified prompt validation in index.ts to check for --agent flag presence
• Agent files with prompts no longer require additional user prompts
• Added example usage with --agent flag to the error message
• Added test case to verify --agent flag bypasses prompt requirement

Example Usage

Before this fix, the following command would fail:

cn -p --agent owner/package
# Error: A prompt is required when using the -p/--print flag.

After this fix, it works correctly:

cn -p --agent owner/package  # Uses agent file's prompt
cn -p --agent owner/package "additional context"  # Combines both prompts

Testing

• Added new test case: "should not require prompt when using --agent flag with -p"
• Existing tests continue to pass

---

This agent session was co-authored by dallin and Continue.

---

Summary by cubic

Allows using --agent with -p in headless mode without a user prompt. Agent files can supply the prompt; optional user text still works.

• Bug Fixes
  • Skip prompt requirement when -p is used with --agent in index.ts.
  • Add agent usage example to the -p error message.
  • Add e2e test to verify --agent bypasses the prompt check.

[github-actions]

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[cubic-dev-ai]

No issues found across 2 files

[sestinj]

🎉 This PR is included in version 1.28.1 🎉

The release is available on:

• npm package (@latest dist-tag)
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[sestinj]

🎉 This PR is included in version 1.25.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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[sestinj]

🎉 This PR is included in version 1.2.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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