1. Add README, LICENSE (MIT), .gitignore, Makefile, CHANGELOG
2. Add Version constant and User-Agent header to all requests
3. Rename SetStream to EnableStream (narrower API surface)
4. Fix FinishReason in CompletionStreamChoice to use typed *FinishReason
5. Type conversation entry Content as chat.Content instead of json.RawMessage
6. Graceful unknown type handling — UnknownEntry, UnknownEvent,
UnknownChunk, UnknownMessage, UnknownAgentTool all return data
instead of erroring on unrecognized discriminator values
7. Type agent tools with AgentTool sealed interface + UnmarshalAgentTool
8. Add pagination params to ListConversations and ListLibraries
9. Move openapi.yaml to docs/openapi.yaml