Apply PR #262's device-buffer fix for clicks caused by audio underruns.
Reconfigure on both output-device and hardware sample-rate changes, respect
the device's frame range, and read back the actual buffer size. Avoid
rewriting unchanged sizes when buffer changes notify the format listener.
Remove listeners before teardown, including failed initialization, so they
cannot configure a device that the AudioUnit has already released.
Add hardware-independent regression coverage for switching, rate changes,
scope filtering, limits, synchronous notifications, diagnostic overrides,
absent devices, and listener cleanup. Record the original gameplay evidence
and the additional silent Core Audio validation in the audio reference.
Validation: full host tests, Mac host build, docs checks, and the iOS source
compile check (178 files) passed. Silent USB/speaker switching and speaker
rates of 44.1/96/48 kHz verified 221/480/240 frames. HDMI switching and
gameplay listening after these listener changes remain unvalidated.
Co-authored-by: parsifal295 <130349765+parsifal295@users.noreply.github.com>
