feat: add -p/--print flag for non-interactive mode in super* commands

[stephanj]

Summary

This PR adds a -p/--print flag to superclaude, supercodex, and supergemini commands that enables non-interactive execution mode.

Why is this needed?

Currently, the super* commands are designed for interactive terminal use - they run docker exec -it with tmux sessions. This works great for human interaction but makes them unsuitable for:

1. Automation tools like Ralph Runner (a macOS GUI for running PRD tasks)
2. CI/CD pipelines that need to run agent commands programmatically
3. Scripting where output needs to be captured and processed
4. Headless environments without a TTY

When these commands are invoked without a TTY, they fail with "the input device is not a TTY".

What this PR does

• Adds _run_agent_command_noninteractive() helper function that:

  • Runs docker exec without -it flags (no TTY required)
  • Outputs directly to stdout for capture
  • Returns the exit code for programmatic handling

• Adds -p/--print flag to:

  • agentbox superclaude -p "prompt"
  • agentbox supercodex -p "prompt"
  • agentbox supergemini -p "prompt"

Example usage

# Interactive mode (default, unchanged behavior)
agentbox superclaude "implement feature X"

# Non-interactive mode (new)
agentbox superclaude -p "implement feature X"

# Capture output in a script
output=$(agentbox superclaude -p "analyze this code" 2>&1)

Test plan

• Verify -p flag is recognized by all three commands
• Verify interactive mode still works without -p flag
• Verify non-interactive mode outputs to stdout
• Verify Python syntax passes

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