test: añadir tests para claude-code provider y router

27 tests nuevos cubriendo las funciones del provider claude-code:

- buildClaudeArgs: minimal, all options, disable_tools, disallowed_tools
- flattenMessages: empty, multi-role, skips system messages
- parseClaudeOutput: success, error response, process failed (con/sin stderr),
  fallback a plain text, content blocks, exec error con stdout parcial
- filterEnv: single key, multiple keys, no match, prefix safety
- Route: claude-code, claude-code/custom, claude-*, gpt-*, ollama/*, default
- ModelName: ollama prefix strip, passthrough

Todos pasan con 'go test -tags goolm ./shell/llm/ ./pkg/llm/'.

pkg/llm/router_test.go

@@ -0,0 +1,48 @@
+package llm
+
+import "testing"
+
+func TestRoute(t *testing.T) {
+	tests := []struct {
+		model string
+		want  ProviderID
+	}{
+		{"claude-code", ProviderClaudeCode},
+		{"claude-code/custom", ProviderClaudeCode},
+		{"claude-sonnet-4-5-20250929", ProviderAnthropic},
+		{"claude-opus-4", ProviderAnthropic},
+		{"gpt-4o", ProviderOpenAI},
+		{"o1-preview", ProviderOpenAI},
+		{"o3-mini", ProviderOpenAI},
+		{"ollama/mistral", ProviderOllama},
+		{"unknown-model", ProviderOpenAI}, // default
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.model, func(t *testing.T) {
+			got := Route(tt.model)
+			if got != tt.want {
+				t.Errorf("Route(%q) = %q, want %q", tt.model, got, tt.want)
+			}
+		})
+	}
+}
+
+func TestModelName(t *testing.T) {
+	tests := []struct {
+		input, want string
+	}{
+		{"ollama/mistral", "mistral"},
+		{"gpt-4o", "gpt-4o"},
+		{"claude-sonnet-4-5-20250929", "claude-sonnet-4-5-20250929"},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.input, func(t *testing.T) {
+			got := ModelName(tt.input)
+			if got != tt.want {
+				t.Errorf("ModelName(%q) = %q, want %q", tt.input, got, tt.want)
+			}
+		})
+	}
+}