Add openai-endpoint plugin

plugins.jsonl

@@ -1 +1,2 @@
 {"name":"blackboard","description":"Shared mesh blackboard for agent status, findings, questions, answers, and searchable coordination notes.","github_url":"https://github.com/mesh-llm/blackboard","author_email":"maintainers@meshllm.cloud","author_name":"Mesh LLM"}
+{"name":"openai-endpoint","description":"Routes mesh-llm inference to an external OpenAI-compatible endpoint such as llama.cpp, vLLM, TGI, Ollama, or Lemonade Server.","github_url":"https://github.com/Mesh-LLM/openai-endpoint","author_email":"maintainers@meshllm.cloud","author_name":"Mesh LLM"}