Add MiniMax Code

[hahhforest]

Summary

Adds MiniMax Code to the ACP Agent Registry.

MiniMax Code speaks ACP natively over stdio, so no adapter package is required:

npm install -g @minimax-ai/code
mcode acp

initialize reports protocolVersion: 1, agentInfo: {name: "minimax-code", title: "MiniMax Code", version: "0.1.3"}, loadSession: true, MCP http/sse, and session list/resume/close. Authentication is Terminal Auth (minimax-code-login, args: ["login"]), advertised once the client declares clientCapabilities._meta["terminal-auth"].

No repository field: MiniMax Code is not developed in a public repository, so version bumps will come from the npm auto-update path.

Validation

Ran against this branch:

uv run --with jsonschema .github/workflows/build_registry.py
python3 .github/workflows/verify_agents.py --auth-check --agent mcode

Build validation: Added agent: mcode v0.1.3

Auth check passed with:

✓ Success: Auth OK: minimax-code-login(terminal)

I also ran a real end-to-end session against the exact command a client resolves from this entry (npm install @minimax-ai/code@0.1.3 --save-exact, then node node_modules/@minimax-ai/code/cli.js acp), driving it with a client that sends the capability set Zed sends. A one-shot "fix this bug and verify it" task completed with stopReason: end_turn, emitting tool_calls with kind: read/edit/execute, absolute locations, a diff content block on the edit, agent_thought_chunks, and available_commands_update. No unhandled methods.

icon.svg is derived from MiniMax Code's official logo, converted to a 16x16 monochrome currentColor SVG.

[hahhforest]

Closing as a duplicate of #515, which predates this and uses the minimax-code id.