Add framework documentation and offline example

docs/integrations/openai-compatible-chat.md

@@ -6,7 +6,9 @@ This document defines the outbound HTTP behavior implemented by Promptkit's
 internal OpenAI-compatible model client. The
 [internal model-client document](../internal/llm.md) owns implementation flow,
 errors, and test ownership. The root Promptkit engine uses this client by
-default unless a consumer injects another implementation.
+default unless a consumer injects another implementation. The
+[framework format reference](../formats.md) owns the profile and prompt values
+that produce these outbound settings.
 
 ## Endpoint And Method