MiniMax moved their Anthropic-compatible API from api.minimax.io to
api.minimaxi.chat. Update ANTHROPIC_BASE_URL in the minimax/v1 context
harness and corresponding comments in init.sh and the TODO note.
Model routing is unaffected: the API defaults unrecognised model names
(e.g. "minimax" from the registry slug) to MiniMax-M3 already.
Claude-Session: https://claude.ai/code/session_01XtWRazqRbMnMRa4iV3zbVx