refactor(vo): address code review for CuVSLAMMonoDepthVisualOdometry

- test_depth_hint_scales_translation: replace assert True with mock-based verification of scale factor
- _init_tracker / _compute_via_cuvslam: logger.exception for stack traces
- _init_tracker: loud warning when Jetson path disabled
- drop personal attribution (git blame suffices)
- translate Ukrainian test docstrings to English

src/gps_denied/core/vo.py

@@ -415,7 +415,6 @@ class CuVSLAMMonoDepthVisualOdometry(ISequentialVisualOdometry):
     Note — solution.md records OdometryMode=INERTIAL which requires stereo.
     This class uses OdometryMode=MONO_DEPTH, the correct mode for our hardware.
     Decision recorded in docs/superpowers/specs/2026-04-18-oss-stack-tech-audit-design.md.
-    By Yuzviak, 2026-04-18.
     """
 
     def __init__(
@@ -462,8 +461,11 @@ class CuVSLAMMonoDepthVisualOdometry(ISequentialVisualOdometry):
             tracker_params.odometry_mode = self._cuvslam.OdometryMode.MONO_DEPTH
             self._tracker = self._cuvslam.Tracker(rig_params, tracker_params)
             logger.info("cuVSLAM tracker initialised in Mono-Depth mode")
-        except Exception as exc:
-            logger.error("cuVSLAM Mono-Depth tracker init failed: %s", exc)
+        except Exception:
+            logger.exception(
+                "cuVSLAM Mono-Depth tracker init FAILED — falling back to ORB. "
+                "Production Jetson path is DISABLED until this is fixed."
+            )
             self._cuvslam = None
 
     @property
@@ -503,8 +505,8 @@ class CuVSLAMMonoDepthVisualOdometry(ISequentialVisualOdometry):
                 tracking_good=True,
                 scale_ambiguous=False,
             )
-        except Exception as exc:
-            logger.error("cuVSLAM Mono-Depth tracking failed: %s", exc)
+        except Exception:
+            logger.exception("cuVSLAM Mono-Depth tracking step failed — frame dropped")
             return None
 
     def _compute_via_orb_scaled(