make sure only single command starts with "ros2".

[fujitatomoya]

closes #62

[fujitatomoya]

@Mergifyio rebase

[mergify]

rebase

✅ Branch has been successfully rebased

[fujitatomoya]

I do not think that this is perfect yet.

To guarantee, we should generate the possible command list and check the generated command by LLM against that table to make sure the command is in the table. but for now, let's leave it there.

[Copilot]

Pull Request Overview

This PR enhances command safety and updates default AI model configurations. It adds protection against executing multiple shell commands by introducing a validation function that extracts only the first ros2 command, and updates the default model from 'gpt-4o' to 'gpt-5' along with adding test cases for newer AI models.

Key changes:

• Adds ros2_single_command() function to prevent execution of chained shell commands
• Updates default OpenAI model to 'gpt-5' and refines system role prompt
• Expands test coverage with additional model versions (o3, o4-mini, gemini-2.5-pro)

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
scripts/verification.sh	Adds test cases for newer AI models (o3, o4-mini, gpt-5, gemini-2.5-pro) and increases timeout parameter
ros2ai/verb/exec.py	Integrates the new command validation function into the exec workflow
ros2ai/api/utils.py	Implements ros2_single_command() to validate and sanitize command strings
ros2ai/api/constants.py	Updates default model to 'gpt-5' and refines system role prompt to emphasize single command execution

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