Add C64 Bridge to community servers

[chrisgleissner]

Adds the C64 Bridge MCP server to the community servers list in the README.md.

Description

This PR introduces the C64 Bridge MCP server to the community servers lineup.

The server lets AI agents operate Commodore 64 Ultimate and Ultimate 64 hardware - modern reincarnations of the Commodore 64 - through their REST API, providing a comprehensive toolset for code execution, memory inspection, audio workflows, and access to a curated knowledge base within MCP-compatible clients.

Motivation and Context

• Create, upload, and run Commodore BASIC or 6502/6510 assembly programs directly on Ultimate hardware.
• Inspect and modify C64 memory, including screen state, for debugging and visualization.
• Drive SID audio playback and analysis with built-in composition and verification helpers.
• Enrich prompts with a curated C64 knowledge base powered by local RAG (retrieval-augmented generation).

How Has This Been Tested?

• Automated execution of currently over 450 tests with 82% coverage as part of each build, see a recent test run
• Manual test with https://github.com/modelcontextprotocol/inspector
• Manual test with Copilot in VS Code to generate code on an Ultimate 64 device as demonstrated in Examples chapter of the C64 Bridge README.

Breaking Changes

None

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update

Checklist

• I have read the MCP Protocol Documentation
• My changes follows MCP security best practices
• I have updated the server's README accordingly
• I have tested this with an LLM client
• My code follows the repository's style guidelines
• New and existing tests pass locally
• I have added appropriate error handling
• I have documented all environment variables and configuration options

Additional context

• Repository: https://github.com/chrisgleissner/c64bridge
• Documentation: See README.md and doc/ within the repository
• License: GPL-2.0

[olaservo]

Cool!