Добавил интеграцию с LLM

internal/llm/json_test.go

@@ -0,0 +1,39 @@
+package llm
+
+import "testing"
+
+func TestExtractJSONObject(t *testing.T) {
+	tests := []struct {
+		name string
+		in   string
+		want string
+	}{
+		{"plain", `{"a":1}`, `{"a":1}`},
+		{"with prose", "Конечно, вот:\n{\"a\":1}\nготово", `{"a":1}`},
+		{"fenced json", "```json\n{\"a\":1}\n```", `{"a":1}`},
+		{"fenced bare", "```\n{\"a\":1}\n```", `{"a":1}`},
+		{"nested", `{"a":{"b":2},"c":3}`, `{"a":{"b":2},"c":3}`},
+		{"brace in string", `{"path":"a{b}c","n":1}`, `{"path":"a{b}c","n":1}`},
+		{"escaped quote in string", `{"q":"he said \"hi\" {x}"}`, `{"q":"he said \"hi\" {x}"}`},
+		{"trailing after object", `{"a":1} extra {ignored}`, `{"a":1}`},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got, err := ExtractJSONObject(tt.in)
+			if err != nil {
+				t.Fatalf("ExtractJSONObject(%q): %v", tt.in, err)
+			}
+			if got != tt.want {
+				t.Errorf("ExtractJSONObject(%q) = %q, want %q", tt.in, got, tt.want)
+			}
+		})
+	}
+}
+
+func TestExtractJSONObject_Errors(t *testing.T) {
+	for _, in := range []string{"", "no json here", "just text", `{"unbalanced":1`} {
+		if _, err := ExtractJSONObject(in); err == nil {
+			t.Errorf("ExtractJSONObject(%q): want error", in)
+		}
+	}
+}