Convert tools.py to a package

src/serena/tools/__init__.py

@@ -0,0 +1,2 @@
+# ruff: noqa
+from .tools_base import *

src/serena/tools/tools_base.py

@@ -32,7 +32,7 @@ from solidlsp import SolidLanguageServer
 from solidlsp.ls_types import SymbolKind
 
 if TYPE_CHECKING:
-    from .agent import LinesRead, MemoriesManager, SerenaAgent
+    from serena.agent import LinesRead, MemoriesManager, SerenaAgent
 
 log = logging.getLogger(__name__)
 T = TypeVar("T")