Third LLM provider option via OpenCode Go subscription ($10/mo). Aggregates DeepSeek / Kimi / GLM / Qwen / MiniMax behind standard OpenAI- and Anthropic-compatible HTTP endpoints. Adopts the substantive design intent of community PR #19 (@Paul-Yuchao-Dong) but not the PR's default-changes or hardcoded model id. 19 new BDD tests (in-process HTTP mock, no wiremock dep). 645 tests passing / 0 failed.