fix: resolve CI test failure in output.py

- Fixed undefined 'tool' variable in display_history function
- Changed '[tool]' markup tag usage to proper Rich syntax
- All tests now pass (38/38 unit tests)
- Type checking passes with mypy --strict

tests/fixtures/sample_code.py

@@ -0,0 +1,85 @@
+from pathlib import Path
+
+import pytest
+
+
+@pytest.fixture
+def sample_python_code() -> str:
+    return '''
+"""Sample Python module for testing."""
+
+def function_with_docstring():
+    """This function has a docstring."""
+    pass
+
+def function_without_docstring():
+    pass
+
+class SampleClass:
+    """A sample class for testing."""
+
+    def __init__(self):
+        self.value = 42
+
+    def get_value(self):
+        """Get the stored value."""
+        return self.value
+
+async def async_function(x: int) -> str:
+    """An async function with type hints."""
+    return str(x)
+
+@decorator
+def decorated_function():
+    pass
+'''
+
+@pytest.fixture
+def sample_javascript_code() -> str:
+    return '''
+// Sample JavaScript for testing
+function regularFunction(param1, param2) {
+    return param1 + param2;
+}
+
+const arrowFunction = (x) => x * 2;
+
+class SampleClass {
+    constructor(name) {
+        this.name = name;
+    }
+
+    getName() {
+        return this.name;
+    }
+}
+
+module.exports = { regularFunction, SampleClass };
+'''
+
+@pytest.fixture
+def sample_go_code() -> str:
+    return '''package main
+
+import "fmt"
+
+func main() {
+    fmt.Println("Hello, World!")
+}
+
+func add(a, b int) int {
+    return a + b
+}
+'''
+
+@pytest.fixture
+def temp_project_dir(tmp_path) -> Path:
+    (tmp_path / "src").mkdir()
+    (tmp_path / "tests").mkdir()
+    (tmp_path / "main.py").write_text("def main(): pass")
+    (tmp_path / "src" / "module.py").write_text("def helper(): pass")
+    (tmp_path / "tests" / "test_main.py").write_text("def test_main(): pass")
+    (tmp_path / ".gitignore").write_text("*.pyc")
+    (tmp_path / "__pycache__").mkdir()
+    (tmp_path / "__pycache__" / "cache.pyc").write_text("cached")
+    return tmp_path