feat(02-03): apply module-level pytestmark to 37 test files

- Add pytestmark = [pytest.mark.<category>] to all 23 root test files and 14 e2e test files
- Marker distribution: 22 unit, 7 integration, 1 blackbox, 1 sitl, 5 e2e + 2 e2e integration
- Add import pytest to test_models.py, test_download.py, test_synthetic_adapter.py (were missing)
- Convert test_sitl_integration.py's bare pytestmark to list form preserving skipif guard
- Union of all 5 markers = 298/298 = 100% coverage; 216 tests pass with --strict-markers

tests/e2e/test_coord.py

@@ -3,6 +3,8 @@
 import numpy as np
 import pytest
 
+pytestmark = [pytest.mark.unit]
+
 from gps_denied.testing.coord import ecef_to_wgs84, euler_to_quaternion
 
 # --- ECEF → WGS84 ---

tests/e2e/test_dataset_base.py

@@ -2,6 +2,8 @@
 
 import pytest
 
+pytestmark = [pytest.mark.unit]
+
 from gps_denied.testing.datasets.base import (
     DatasetAdapter,
     DatasetCapabilities,

tests/e2e/test_download.py

@@ -3,6 +3,10 @@
 import hashlib
 from pathlib import Path
 
+import pytest
+
+pytestmark = [pytest.mark.unit]
+
 from gps_denied.testing.download import (
     DATASET_REGISTRY,
     DatasetSpec,

tests/e2e/test_euroc.py

@@ -13,6 +13,8 @@ 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

tests/e2e/test_euroc_adapter.py

@@ -4,6 +4,8 @@ from pathlib import Path
 
 import pytest
 
+pytestmark = [pytest.mark.unit]
+
 from gps_denied.testing.datasets.base import (
     DatasetNotAvailableError,
     PlatformClass,

tests/e2e/test_euroc_mh_all.py

@@ -17,6 +17,8 @@ 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

tests/e2e/test_euroc_vo_only.py

@@ -20,6 +20,8 @@ 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

tests/e2e/test_harness_smoke.py

@@ -7,6 +7,8 @@ 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
 

tests/e2e/test_mars_lvig.py

@@ -4,6 +4,8 @@ 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
 

tests/e2e/test_mars_lvig_adapter.py

@@ -4,6 +4,8 @@ from pathlib import Path
 
 import pytest
 
+pytestmark = [pytest.mark.unit]
+
 from gps_denied.testing.datasets.base import (
     DatasetNotAvailableError,
     PlatformClass,

tests/e2e/test_metrics.py

@@ -3,6 +3,8 @@
 import numpy as np
 import pytest
 
+pytestmark = [pytest.mark.unit]
+
 from gps_denied.testing.metrics import (
     absolute_trajectory_error,
     relative_pose_error,

tests/e2e/test_synthetic_adapter.py

@@ -1,8 +1,11 @@
 """SyntheticAdapter produces a deterministic straight-line trajectory."""
 
 import numpy as np
+import pytest
 
 from gps_denied.testing.datasets.base import PlatformClass
+
+pytestmark = [pytest.mark.unit]
 from gps_denied.testing.datasets.synthetic import SyntheticAdapter
 
 

tests/e2e/test_vpair.py

@@ -8,6 +8,8 @@ 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

tests/e2e/test_vpair_adapter.py

@@ -10,6 +10,8 @@ from pathlib import Path
 import numpy as np
 import pytest
 
+pytestmark = [pytest.mark.unit]
+
 from gps_denied.testing.datasets.base import (
     DatasetNotAvailableError,
     PlatformClass,

tests/test_acceptance.py

@@ -13,6 +13,8 @@ from unittest.mock import AsyncMock, MagicMock
 import numpy as np
 import pytest
 
+pytestmark = [pytest.mark.integration]
+
 from gps_denied.core.chunk_manager import RouteChunkManager
 from gps_denied.core.gpr import GlobalPlaceRecognition
 from gps_denied.core.graph import FactorGraphOptimizer

tests/test_accuracy.py

@@ -22,6 +22,8 @@ import time
 import numpy as np
 import pytest
 
+pytestmark = [pytest.mark.integration]
+
 from gps_denied.core.benchmark import (
     AccuracyBenchmark,
     BenchmarkResult,

tests/test_api_flights.py

@@ -3,6 +3,9 @@
 import json
 
 import pytest
+
+pytestmark = [pytest.mark.integration]
+
 from httpx import ASGITransport, AsyncClient
 from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker, create_async_engine
 

tests/test_chunk_manager.py

@@ -3,6 +3,8 @@
 import numpy as np
 import pytest
 
+pytestmark = [pytest.mark.unit]
+
 from gps_denied.core.chunk_manager import RouteChunkManager
 from gps_denied.core.graph import FactorGraphOptimizer
 from gps_denied.schemas.chunk import ChunkStatus

tests/test_coordinates.py

@@ -3,6 +3,8 @@
 import numpy as np
 import pytest
 
+pytestmark = [pytest.mark.unit]
+
 from gps_denied.core.coordinates import (
     CoordinateTransformer,
     OriginNotSetError,

tests/test_database.py

@@ -1,6 +1,9 @@
 """Tests for the database layer — CRUD, cascade, transactions."""
 
 import pytest
+
+pytestmark = [pytest.mark.integration]
+
 from sqlalchemy import event
 from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker, create_async_engine
 

tests/test_eskf.py

@@ -3,6 +3,8 @@
 import numpy as np
 import pytest
 
+pytestmark = [pytest.mark.unit]
+
 from gps_denied.core.coordinates import CoordinateTransformer
 from gps_denied.core.eskf import ESKF
 from gps_denied.schemas import GPSPoint

tests/test_gpr.py

@@ -3,6 +3,8 @@
 import numpy as np
 import pytest
 
+pytestmark = [pytest.mark.unit]
+
 from gps_denied.core.gpr import GlobalPlaceRecognition
 from gps_denied.core.models import ModelManager
 from gps_denied.schemas.gpr import TileCandidate

tests/test_gps_input_encoding.py

@@ -17,6 +17,8 @@ import time
 import numpy as np
 import pytest
 
+pytestmark = [pytest.mark.blackbox]
+
 from gps_denied.core.mavlink import _confidence_to_fix_type, _eskf_to_gps_input
 from gps_denied.schemas import GPSPoint
 from gps_denied.schemas.eskf import ConfidenceTier, ESKFState

tests/test_graph.py

@@ -3,6 +3,8 @@
 import numpy as np
 import pytest
 
+pytestmark = [pytest.mark.unit]
+
 from gps_denied.core.graph import FactorGraphOptimizer
 from gps_denied.schemas import GPSPoint
 from gps_denied.schemas.graph import FactorGraphConfig

tests/test_health.py

@@ -1,6 +1,9 @@
 """Tests for the health endpoint."""
 
 import pytest
+
+pytestmark = [pytest.mark.integration]
+
 from httpx import ASGITransport, AsyncClient
 
 from gps_denied.app import app

tests/test_mavlink.py

@@ -14,6 +14,8 @@ import time
 import numpy as np
 import pytest
 
+pytestmark = [pytest.mark.unit]
+
 from gps_denied.core.mavlink import (
     MAVLinkBridge,
     MockMAVConnection,

tests/test_metric.py

@@ -3,6 +3,8 @@
 import numpy as np
 import pytest
 
+pytestmark = [pytest.mark.unit]
+
 from gps_denied.core.metric import MetricRefinement
 from gps_denied.core.models import ModelManager
 from gps_denied.schemas import GPSPoint

tests/test_models.py

@@ -1,9 +1,12 @@
 """Tests for Model Manager (F16)."""
 
 import numpy as np
+import pytest
 
 from gps_denied.core.models import ModelManager
 
+pytestmark = [pytest.mark.unit]
+
 
 def test_load_and_get_model():
     manager = ModelManager()

tests/test_pipeline.py

@@ -5,6 +5,8 @@ import cv2
 import numpy as np
 import pytest
 
+pytestmark = [pytest.mark.unit]
+
 from gps_denied.core.pipeline import ImageInputPipeline, QueueFullError
 from gps_denied.schemas.image import ImageBatch
 

tests/test_processor_full.py

@@ -5,6 +5,8 @@ from unittest.mock import AsyncMock, MagicMock
 import numpy as np
 import pytest
 
+pytestmark = [pytest.mark.integration]
+
 from gps_denied.core.chunk_manager import RouteChunkManager
 from gps_denied.core.gpr import GlobalPlaceRecognition
 from gps_denied.core.graph import FactorGraphOptimizer

tests/test_processor_pipe.py

@@ -14,6 +14,8 @@ from unittest.mock import AsyncMock, MagicMock
 import numpy as np
 import pytest
 
+pytestmark = [pytest.mark.integration]
+
 from gps_denied.core.coordinates import CoordinateTransformer
 from gps_denied.core.processor import FlightProcessor, TrackingState
 from gps_denied.core.rotation import ImageRotationManager

tests/test_recovery.py

@@ -3,6 +3,8 @@
 import numpy as np
 import pytest
 
+pytestmark = [pytest.mark.unit]
+
 from gps_denied.core.chunk_manager import RouteChunkManager
 from gps_denied.core.gpr import GlobalPlaceRecognition
 from gps_denied.core.graph import FactorGraphOptimizer

tests/test_rotation.py

@@ -5,6 +5,8 @@ from datetime import datetime, timezone
 import numpy as np
 import pytest
 
+pytestmark = [pytest.mark.unit]
+
 from gps_denied.core.rotation import IImageMatcher, ImageRotationManager
 from gps_denied.schemas import GPSPoint
 from gps_denied.schemas.rotation import RotationResult

tests/test_satellite.py

@@ -3,6 +3,8 @@
 import numpy as np
 import pytest
 
+pytestmark = [pytest.mark.unit]
+
 from gps_denied.core.satellite import SatelliteDataManager
 from gps_denied.schemas import GPSPoint
 from gps_denied.utils import mercator

tests/test_schemas.py

@@ -3,6 +3,9 @@
 from datetime import datetime, timezone
 
 import pytest
+
+pytestmark = [pytest.mark.unit]
+
 from pydantic import ValidationError
 
 from gps_denied.config import get_settings

tests/test_sitl_integration.py

@@ -42,10 +42,10 @@ SITL_PORT = int(os.environ.get("ARDUPILOT_SITL_PORT", "5762"))
 
 _SITL_AVAILABLE = bool(SITL_HOST)
 
-pytestmark = pytest.mark.skipif(
+pytestmark = [pytest.mark.sitl, pytest.mark.skipif(
     not _SITL_AVAILABLE,
     reason="SITL integration tests require ARDUPILOT_SITL_HOST env var",
-)
+)]
 
 # ---------------------------------------------------------------------------
 # Helpers

tests/test_vo.py

@@ -3,6 +3,8 @@
 import numpy as np
 import pytest
 
+pytestmark = [pytest.mark.unit]
+
 from gps_denied.core.models import ModelManager
 from gps_denied.core.vo import (
     CuVSLAMVisualOdometry,