complete: use backend.Generate instead of copilot session

session/session.go

@@ -1140,7 +1140,7 @@ func squashWhitespace(s string) string {
 
 // --- Code Completion ---
 
-// Complete performs a single-shot code completion using a dedicated copilot session.
+// Complete performs a stateless one-shot code completion via backend.Generate.
 func (s *Manager) Complete(cwd, filePath, prefix, suffix, extraContext string) (string, error) {
 	if cwd == "" {
 		cwd, _ = os.Getwd()
@@ -1162,18 +1162,6 @@ func (s *Manager) Complete(cwd, filePath, prefix, suffix, extraContext string) (
 		suffix = suffix[:suffixMax]
 	}
 
-	sessID := s.findOrCreateCopilot(cwd, backendName, model)
-	if sessID == "" {
-		return "", fmt.Errorf("failed to create copilot session")
-	}
-
-	s.mu.RLock()
-	sess, ok := s.sessions[sessID]
-	s.mu.RUnlock()
-	if !ok {
-		return "", fmt.Errorf("copilot session disappeared")
-	}
-
 	fileHint := ""
 	if filePath != "" {
 		fileHint = " in " + filePath
@@ -1191,79 +1179,20 @@ func (s *Manager) Complete(cwd, filePath, prefix, suffix, extraContext string) (
 %s
 </suffix>`, fileHint, contextBlock, prefix, suffix)
 
-	sess.Core.Submit(sess.Ctx, "/clear")
-	sess.Core.Submit(sess.Ctx, prompt)
-
-	for {
-		state := sess.Core.State()
-		if state == "idle" {
-			break
-		}
-		next, ok := sess.Core.WaitChange(sess.Ctx, agent.WatchState, state)
-		if !ok {
-			return "", fmt.Errorf("copilot session cancelled")
-		}
-		if next == "idle" {
-			break
-		}
+	result, err := backend.Generate(context.Background(), backend.GenerateRequest{
+		Prompt:  prompt,
+		Backend: backendName,
+		Model:   model,
+	})
+	if err != nil {
+		return "", err
 	}
 
-	result := sess.Core.Reply()
 	result = stripCompletionNoise(result)
 	result = stripPrefixEcho(prefix, result)
 	return result, nil
 }
 
-func (s *Manager) findOrCreateCopilot(cwd, backendName, modelName string) string {
-	sessID := fmt.Sprintf("%d-copilot", crc32Str(cwd))
-
-	s.mu.RLock()
-	_, exists := s.sessions[sessID]
-	s.mu.RUnlock()
-	if exists {
-		return sessID
-	}
-
-	cfg := LoadAgentConfig(s.cfg.AgentsDir, "copilot", nil)
-	be, err := backend.NewWithName(backendName)
-	if err != nil {
-		return ""
-	}
-	if modelName != "" {
-		be.SetModel(modelName)
-	}
-
-	uname := s.nextUname()
-	newDisp := tools.NewDispatcherFunc(map[string]func() tools.Server{
-		"execute": execute.Decl(cwd),
-	})
-	rt := agent.BuildRuntime(cfg, newDisp(), cwd, []string{"OLLIE_SESSION_ID=" + sessID})
-
-	core := agent.NewAgentCore(agent.AgentCoreConfig{
-		Backend:       be,
-		AgentName:     "copilot",
-		AgentsDir:     s.cfg.AgentsDir,
-		SessionsDir:   s.cfg.SessionsDir,
-		SessionID:     sessID,
-		Uname:         uname,
-		CWD:           cwd,
-		Runtime:       rt,
-		NewDispatcher: newDisp,
-		Log:           s.cfg.Sink.NewLogger("copilot"),
-	})
-
-	ctx, cancel := context.WithCancel(context.Background())
-	sess := NewSession(sessID, core, ctx, cancel)
-	sess.uname = uname
-
-	s.mu.Lock()
-	s.sessions[sessID] = sess
-	s.mu.Unlock()
-	if s.cfg.OnSessionCreated != nil {
-		s.cfg.OnSessionCreated(sessID, sess)
-	}
-	return sessID
-}
 
 func stripCompletionNoise(s string) string {
 	var lines []string