ollamarunner: Quiet debug logging and panic on unimplemented features

Debug logging of every token has previously caused test timeouts
on slower machines.

runner/ollamarunner/runner.go

@@ -436,8 +436,10 @@ func (s *Server) processBatch() error {
 		// if done processing the prompt, generate an embedding and return
 		if seq.embeddingOnly {
 			// TODO(jessegross): Embedding support
-			s.removeSequence(i, "")
-			continue
+			// s.removeSequence(i, "")
+			// continue
+
+			panic("generation of embedding outputs not yet supported")
 		}
 
 		// sample a token
@@ -597,6 +599,10 @@ func (s *Server) completion(w http.ResponseWriter, r *http.Request) {
 		req.Seed,
 	)
 
+	if req.Grammar != "" {
+		panic("grammars are not yet supported")
+	}
+
 	seq, err := s.NewSequence(req.Prompt, req.Images, NewSequenceParams{
 		numPredict: req.NumPredict,
 		stop:       req.Stop,