Add self-contrast framework, V5 tools baseline, and benchmark artifacts

src/task_solver/__init__.py

@@ -1,6 +1,25 @@
 """Task solving module with debate-based approach."""
 
-from .generator import solve_tasks
+from __future__ import annotations
 
+from typing import Any
+
+
+def _missing_solve_tasks(*_args: Any, **_kwargs: Any) -> Any:
+    """Raise a clear error when optional generator dependencies are missing."""
+    raise ImportError(
+        "src.task_solver.generator requires optional dependencies that are not "
+        "installed in this environment."
+    )
+
+
+solve_tasks = _missing_solve_tasks
+
+try:
+    from .generator import solve_tasks as _solve_tasks
+except Exception:
+    pass
+else:
+    solve_tasks = _solve_tasks
 
 __all__ = ["solve_tasks"]

src/task_solver/self_contrast/.gitignore

@@ -0,0 +1,4 @@
+# Local Python cache artifacts
+__pycache__/
+*.pyc
+*.pyo