fix(lint): resolve all ruff E402/I001/F821 errors

- Move pytestmark after all imports in 35 test files (E402: not-at-top)
- Add TYPE_CHECKING guard for FlightProcessor in composition.py (F821)
- Sort import blocks in src/ and tests/ (I001 auto-fix via ruff --fix)
- ruff check src/ tests/ now exits 0 with no errors

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/e2e/test_coord.py

@@ -3,10 +3,10 @@
 import numpy as np
 import pytest
 
-pytestmark = [pytest.mark.unit]
-
 from gps_denied.testing.coord import ecef_to_wgs84, euler_to_quaternion
 
+pytestmark = [pytest.mark.unit]
+
 # --- ECEF → WGS84 ---
 
 def test_ecef_origin_is_on_equator_prime_meridian():

tests/e2e/test_dataset_base.py

@@ -2,8 +2,6 @@
 
 import pytest
 
-pytestmark = [pytest.mark.unit]
-
 from gps_denied.testing.datasets.base import (
     DatasetAdapter,
     DatasetCapabilities,
@@ -14,6 +12,8 @@ from gps_denied.testing.datasets.base import (
     PlatformClass,
 )
 
+pytestmark = [pytest.mark.unit]
+
 
 def test_capabilities_defaults():
     cap = DatasetCapabilities(

tests/e2e/test_download.py

@@ -5,8 +5,6 @@ from pathlib import Path
 
 import pytest
 
-pytestmark = [pytest.mark.unit]
-
 from gps_denied.testing.download import (
     DATASET_REGISTRY,
     DatasetSpec,
@@ -14,6 +12,8 @@ from gps_denied.testing.download import (
     verify_sha256,
 )
 
+pytestmark = [pytest.mark.unit]
+
 
 def test_registry_has_euroc_machine_hall():
     assert "euroc_machine_hall" in DATASET_REGISTRY

tests/e2e/test_euroc.py

@@ -13,12 +13,12 @@ from pathlib import Path
 
 import pytest
 
-pytestmark = [pytest.mark.e2e]
-
 from gps_denied.testing.datasets.euroc import EuRoCAdapter
 from gps_denied.testing.harness import E2EHarness
 from gps_denied.testing.metrics import absolute_trajectory_error
 
+pytestmark = [pytest.mark.e2e]
+
 # CI-tier keeps the prefix short so a full run stays under a couple of minutes.
 EUROC_MH01_MAX_FRAMES = 100
 

tests/e2e/test_euroc_adapter.py

@@ -4,14 +4,14 @@ from pathlib import Path
 
 import pytest
 
-pytestmark = [pytest.mark.unit]
-
 from gps_denied.testing.datasets.base import (
     DatasetNotAvailableError,
     PlatformClass,
 )
 from gps_denied.testing.datasets.euroc import EuRoCAdapter
 
+pytestmark = [pytest.mark.unit]
+
 
 @pytest.fixture
 def fake_euroc_root(tmp_path: Path) -> Path:

tests/e2e/test_euroc_mh_all.py

@@ -17,12 +17,12 @@ from pathlib import Path
 
 import pytest
 
-pytestmark = [pytest.mark.e2e]
-
 from gps_denied.testing.datasets.euroc import EuRoCAdapter
 from gps_denied.testing.harness import E2EHarness
 from gps_denied.testing.metrics import absolute_trajectory_error
 
+pytestmark = [pytest.mark.e2e]
+
 MAX_FRAMES = 100
 VO_SCALE_M = 0.005  # 5 mm/frame — measured GT median on MH_01
 

tests/e2e/test_euroc_vo_only.py

@@ -20,12 +20,12 @@ import cv2
 import numpy as np
 import pytest
 
-pytestmark = [pytest.mark.e2e]
-
 from gps_denied.core.vo import ORBVisualOdometry
 from gps_denied.schemas import CameraParameters
 from gps_denied.testing.datasets.euroc import EuRoCAdapter
 
+pytestmark = [pytest.mark.e2e]
+
 # Match CI-tier frame cap used in test_euroc.py
 EUROC_MH01_MAX_FRAMES = 100
 

tests/e2e/test_harness_smoke.py

@@ -7,11 +7,11 @@ Correctness of VO on synthetic is out of scope — that's unit-test territory.
 
 import pytest
 
-pytestmark = [pytest.mark.integration]
-
 from gps_denied.testing.datasets.synthetic import SyntheticAdapter
 from gps_denied.testing.harness import E2EHarness, HarnessResult
 
+pytestmark = [pytest.mark.integration]
+
 
 @pytest.mark.asyncio
 async def test_harness_processes_every_frame():

tests/e2e/test_mars_lvig.py

@@ -4,11 +4,11 @@ from pathlib import Path
 
 import pytest
 
-pytestmark = [pytest.mark.e2e]
-
 from gps_denied.testing.datasets.mars_lvig import MARSLVIGAdapter
 from gps_denied.testing.harness import E2EHarness
 
+pytestmark = [pytest.mark.e2e]
+
 # Stress tier does not gate on RMSE — featureless sequences legitimately cause
 # tracking loss. The gate is whether the pipeline RUNS TO COMPLETION without
 # crashing, and what fraction of frames produced any estimate at all.

tests/e2e/test_mars_lvig_adapter.py

@@ -4,14 +4,14 @@ from pathlib import Path
 
 import pytest
 
-pytestmark = [pytest.mark.unit]
-
 from gps_denied.testing.datasets.base import (
     DatasetNotAvailableError,
     PlatformClass,
 )
 from gps_denied.testing.datasets.mars_lvig import MARSLVIGAdapter
 
+pytestmark = [pytest.mark.unit]
+
 
 @pytest.fixture
 def fake_mars_seq(tmp_path: Path) -> Path:

tests/e2e/test_metrics.py

@@ -3,14 +3,14 @@
 import numpy as np
 import pytest
 
-pytestmark = [pytest.mark.unit]
-
 from gps_denied.testing.metrics import (
     absolute_trajectory_error,
     relative_pose_error,
     trajectory_rmse,
 )
 
+pytestmark = [pytest.mark.unit]
+
 
 def test_rmse_identical_trajectories_is_zero():
     est = np.array([[0.0, 0.0, 0.0], [1.0, 0.0, 0.0], [2.0, 0.0, 0.0]])

tests/e2e/test_synthetic_adapter.py

@@ -4,9 +4,9 @@ import numpy as np
 import pytest
 
 from gps_denied.testing.datasets.base import PlatformClass
+from gps_denied.testing.datasets.synthetic import SyntheticAdapter
 
 pytestmark = [pytest.mark.unit]
-from gps_denied.testing.datasets.synthetic import SyntheticAdapter
 
 
 def test_synthetic_has_raw_imu():

tests/e2e/test_vpair.py

@@ -8,12 +8,12 @@ from pathlib import Path
 
 import pytest
 
-pytestmark = [pytest.mark.e2e]
-
 from gps_denied.testing.datasets.vpair import VPAIRAdapter
 from gps_denied.testing.harness import E2EHarness
 from gps_denied.testing.metrics import absolute_trajectory_error
 
+pytestmark = [pytest.mark.e2e]
+
 VPAIR_SAMPLE_RMSE_CEILING_M = 20.0  # initial target, calibrate after first runs
 
 

tests/e2e/test_vpair_adapter.py

@@ -10,14 +10,14 @@ from pathlib import Path
 import numpy as np
 import pytest
 
-pytestmark = [pytest.mark.unit]
-
 from gps_denied.testing.datasets.base import (
     DatasetNotAvailableError,
     PlatformClass,
 )
 from gps_denied.testing.datasets.vpair import VPAIRAdapter
 
+pytestmark = [pytest.mark.unit]
+
 # 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.