feat: Python porting workspace with reference data and parity audit

src/tasks.py

@@ -0,0 +1,11 @@
+from __future__ import annotations
+
+from .task import PortingTask
+
+
+def default_tasks() -> list[PortingTask]:
+    return [
+        PortingTask('root-module-parity', 'Mirror the root module surface of the archived snapshot'),
+        PortingTask('directory-parity', 'Mirror top-level subsystem names as Python packages'),
+        PortingTask('parity-audit', 'Continuously measure parity against the local archive'),
+    ]