capture drives the device synchronously (as Proxmark3.sync()'s proxy exposes it). Passing a
bare async Proxmark3() — whose methods return un-awaited coroutines, and which isn't even
connected — blew up deep in the demod with "object of type 'coroutine' has no len()". Now
identify_lf detects a coroutine-function device up front and raises an actionable TypeError
pointing at Proxmark3.sync().
The mock-based tests returned plain values, so they never exercised the async method shape;
added a test using a real coroutine function that reproduces and guards it.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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