core(openai): map temperature/top_p for Responses API; align ChatComp…

[thekavishshah]

…letions tool transform defaults to satisfy malformed tool config tests; security(vault): guard JSONFileVault watcher when no vault file provided to prevent chokidar errors\n\n- Add null checks before file watching\n- Add temperature and top_p to Responses API body when provided\n- Preserve undefined shapes in ChatCompletions transform for error-case parity\n- All affected core OpenAI unit tests pass locally

📝 Description

🔗 Related Issues

• Fixes #
• Relates to #

🔧 Type of Change

• 🐛 Bug fix (non-breaking change that fixes an issue)
• ✨ New feature (non-breaking change that adds functionality)
• 📚 Documentation update
• 🔧 Code refactoring (no functional changes)
• 🧪 Test improvements
• 🔨 Build/CI changes

✅ Checklist

• Self-review performed
• Tests added/updated
• Documentation updated (if needed)

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