Enhanced "AI Tools Available" section to document mod-provided tools and game ID prefixing

[Copilot]

The "AI Tools Available" section in README.md was incomplete and didn't explain the key concept that GABP-compliant mods expose their own tools to AI agents. This enhancement addresses the missing documentation around mod tools and the game ID prefixing mechanism.

What was missing

The original section only listed GABS's core game management tools (games_list, games_start, etc.) but completely omitted:

• The fact that mods add their own game-specific tools
• How game ID prefixing works to avoid conflicts in multi-game scenarios
• How AI agents discover and use mod-provided tools

Changes made

The enhanced section now includes:

Core Game Management Tools - Organized the existing GABS tools under a clear subsection and added the missing games_tools command.

Game-Specific Tools from Mods - A new section explaining:

• That "the real power comes from GABP-compliant mods that expose their own tools"
• Concrete examples like minecraft_inventory_get, rimworld_crafting_build
• The game ID prefixing mechanism (e.g., minecraft_, rimworld_) that prevents tool name conflicts
• How AI agents use games_tools to discover available mod tools

Why this matters

This documentation gap made it unclear how AI agents actually interact with games beyond basic start/stop operations. The real value of GABS comes from mods exposing rich game functionality through GABP, and the game ID prefixing ensures this works seamlessly even with multiple games running simultaneously.

The changes align with the existing test suite which validates the game-prefixed tool naming convention and multi-game scenarios.

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