Expose game state and commands to MCP

**What do you want to see?**
Expose the game code, especially commands and anything that would be needed to determine which commands to issue, to MCP (Model Context Protocol)

**How would it help players?**
* Allow AI players (#7) to be created using an LLM
* Allow an AI assistant (#509) to be added

**Alternatives**
???

**Screenshots and mockups**
n/a

**Things to consider**
What classes and functions are most important to expose to MCP?

**Related issues**
#7