fix: raise max_chunks to 128 for metadata-only 5A download

For 2-second events at 1024 sps the "Project:" metadata frame appears
beyond chunk 32 (the old default cap), causing the safety limit to be
hit and ~34 KB of waveform data to be downloaded instead of stopping
at the metadata frame.  Raising max_chunks to 128 ensures
stop_after_metadata=True can locate the metadata frame for record
times up to ~4 seconds.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

minimateplus/client.py

@@ -624,6 +624,7 @@ class MiniMateClient:
                             cur_key, stop_after_metadata=True,
                             include_terminator=True,
                             extra_chunks_after_metadata=extra_chunks_after_metadata,
+                            max_chunks=128,
                         )
                         if a5_frames:
                             a5_ok = True