feat(ovision): add stereo-inertial camera adapter

[styu12]

Summary

• add strict OVISION V2/V3 H.264 SEI and MJPEG metadata parsing
• read and CRC-verify per-unit UVC flash calibration
• record packed stereo H.264 plus frame-aligned stereo/IMU/magnetometer sidecars
• publish an ovision optional dependency extra

Hardware verification

• OVISION USB serial 064014231235 on Raspberry Pi 5
• 428 video frames / 428 stereo metadata rows at 30.0003 fps
• accel+gyro 504.17 Hz, magnetometer ~100 Hz
• left/right device-clock exposure skew 9-63 us, zero trigger gaps
• calibration schema v2 and CRC verified

Tests

• uv run pytest -q (1265 passed, 2 skipped)
• uv run pytest -q tests/unit/adapters/test_ovision_metadata.py (11 passed)
• git diff --check