style(e2e): ruff auto-fix import sorting in coord + vpair + tests

Four I001 violations surfaced when running ruff over the full src/
tests/ tree (the CI command) rather than just the testing subpath:
- src/gps_denied/testing/coord.py
- src/gps_denied/testing/datasets/vpair.py
- tests/e2e/test_coord.py
- tests/e2e/test_vpair_adapter.py

All auto-fixable; no behavioural change.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tests/e2e/test_coord.py

@@ -5,7 +5,6 @@ import pytest
 
 from gps_denied.testing.coord import ecef_to_wgs84, euler_to_quaternion
 
-
 # --- ECEF → WGS84 ---
 
 def test_ecef_origin_is_on_equator_prime_meridian():

tests/e2e/test_vpair_adapter.py

@@ -16,7 +16,6 @@ from gps_denied.testing.datasets.base import (
 )
 from gps_denied.testing.datasets.vpair import VPAIRAdapter
 
-
 # ECEF for a point at roughly lat=50.737°, lon=7.095°, alt=350m (Bonn/Eifel region).
 # Chosen to hit the real VPAIR geographic area so the adapter's conversion
 # produces plausible numbers the tests can assert on.