chore(m2): green the ruff baseline before M2 orchestration

- ignore E402 in scripts/*.py (deliberate sys.path bootstrap before app imports)
- drop unused pathlib.Path import in tests/test_auth.py

Establishes a clean ruff gate so each M2 task can be verified green at its boundary.

pyproject.toml

@@ -26,3 +26,8 @@ pythonpath = ["."]
 
 [tool.ruff]
 line-length = 100
+
+[tool.ruff.lint.per-file-ignores]
+# Scripts bootstrap sys.path before importing app modules, so their top-level
+# app imports legitimately sit below executable setup code.
+"scripts/*.py" = ["E402"]

tests/test_auth.py

@@ -1,6 +1,5 @@
 import re
 import sqlite3
-from pathlib import Path
 
 from fastapi.testclient import TestClient