Add inline comments throughout wiegand_formatutils and callers to explain
sentinel-bit stripping, HID transport framing, and the normalization contract
between input modes and downstream consumers.
Replace sim-only LF HID online tests with T55xx clone+readback flows and add
a full encode/decode roundtrip harness for hf mf encodehid, including sector
restore/cleanup and an optional --manual flag for external reader verification.