Add metadata json field to Message, store generation model/provider

pkg/api/provider/provider.go

@@ -6,8 +6,6 @@ import (
 	"git.mlow.ca/mlow/lmcli/pkg/api"
 )
 
-type ReplyCallback func(api.Message)
-
 type Chunk struct {
 	Content    string
 	TokenCount uint
@@ -24,9 +22,8 @@ type RequestParameters struct {
 }
 
 type ChatCompletionProvider interface {
-	// CreateChatCompletion requests a response to the provided messages.
-	// Replies are appended to the given replies struct, and the
-	// complete user-facing response is returned as a string.
+	// CreateChatCompletion generates a chat completion response to the
+	// provided messages.
 	CreateChatCompletion(
 		ctx context.Context,
 		params RequestParameters,
@@ -34,7 +31,7 @@ type ChatCompletionProvider interface {
 	) (*api.Message, error)
 
 	// Like CreateChageCompletion, except the response is streamed via
-	// the output channel as it's received.
+	// the output channel.
 	CreateChatCompletionStream(
 		ctx context.Context,
 		params RequestParameters,