refactor: split precheck state snapshot and analysis

src/coinhunter/services/precheck_snapshot.py

@@ -0,0 +1,9 @@
+"""Snapshot construction helpers for precheck."""
+
+from __future__ import annotations
+
+from .. import precheck as precheck_module
+
+
+def build_snapshot() -> dict:
+    return precheck_module.build_snapshot()