[appkit plugin] [3/x] Add appkit-agent documentation #589

Job	Run time
typechecking for integrations/openai	14s
ruff check for integrations/llamaindex	10s
typechecking for .	13s
ruff check for integrations/dspy	14s
format	15s
ruff check for integrations/langchain	11s
typechecking for integrations/llamaindex	12s
typechecking for integrations/langchain	13s
typechecking for databricks_mcp	10s
typechecking for integrations/dspy	12s
ruff check for .	15s
ruff check for integrations/openai	11s
ruff check for databricks_mcp	10s
	2m 40s

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