"""Public-boundary helper modules used by every blackbox test.

Modules:
    frame_source_replay   — replay images/video to the SUT's V4L2 file source
    imu_replay            — replay `data_imu.csv` at 10 Hz to the FC inbound
    sitl_observer         — AP/iNav read-side observers (param reads, GPS_RAW_INT, MSP queries)
    mavproxy_tlog_reader  — parse `.tlog` files emitted by `mavproxy-listener`
    fdr_reader            — post-run filesystem read of the FDR archive
    geo                   — Vincenty / WGS84 geodesic helpers

These modules MUST NOT import from `gps_denied_onboard.*`. Public-boundary
discipline is enforced by `e2e/_unit_tests/test_no_sut_imports.py`.
"""