fix: local picolm provider no longer requires API key (#488)

- Add providerTypePicoLM constant for local picolm provider
- Add explicit 'picolm' case in provider selection
- Add fallback case for models starting with 'picolm/'
- Local picolm provider now bypasses API key requirement
- Fixes issue where local inference with GGUF models failed with 'no API key' error

pkg/providers/factory.go

@@ -22,6 +22,7 @@ const (
 	providerTypeClaudeCLI
 	providerTypeCodexCLI
 	providerTypeGitHubCopilot
+	providerTypePicoLM
 )
 
 type providerSelection struct {
@@ -199,6 +200,15 @@ func resolveProviderSelection(cfg *config.Config) (providerSelection, error) {
 			}
 			sel.connectMode = cfg.Providers.GitHubCopilot.ConnectMode
 			return sel, nil
+		case "picolm":
+			// Local picolm provider - no API key required
+			workspace := cfg.WorkspacePath()
+			if workspace == "" {
+				workspace = "."
+			}
+			sel.providerType = providerTypePicoLM
+			sel.workspace = workspace
+			return sel, nil
 		}
 	}
 
@@ -300,6 +310,15 @@ func resolveProviderSelection(cfg *config.Config) (providerSelection, error) {
 			if sel.apiBase == "" {
 				sel.apiBase = "https://api.mistral.ai/v1"
 			}
+		case strings.Contains(lowerModel, "picolm") || strings.HasPrefix(model, "picolm/"):
+			// Local picolm provider - no API key required
+			workspace := cfg.WorkspacePath()
+			if workspace == "" {
+				workspace = "."
+			}
+			sel.providerType = providerTypePicoLM
+			sel.workspace = workspace
+			return sel, nil
 		case cfg.Providers.VLLM.APIBase != "":
 			sel.apiKey = cfg.Providers.VLLM.APIKey
 			sel.apiBase = cfg.Providers.VLLM.APIBase