Revert "fix: improve metadata frame detection and update version to v0.12.1"

This reverts commit ad7b064b67.

minimateplus/protocol.py

@@ -125,20 +125,6 @@ _BULK_COUNTER_STEP = 0x0400   # chunk counter increment per chunk ✅
 # protocol requirement.  Confirmed 2026-04-06: 0x0400 for chunk 1 works; 0x1004
 # causes a 120-second device timeout.  Formula n * 0x0400 is used for all chunks.
 
-# Needles for identifying the 5A metadata frame.
-# Devices with no Project/Client/etc. configured omit those label strings,
-# so b"Geo: " (geo threshold — always present) is the universal fallback.
-# Mirror of _METADATA_FRAME_NEEDLES in client.py; kept here for the
-# stop_after_metadata check in read_bulk_waveform_stream.
-_METADATA_FRAME_NEEDLES: tuple[bytes, ...] = (
-    b"Project:",
-    b"Client:",
-    b"User Name:",
-    b"Seis Loc:",
-    b"Extended Notes",
-    b"Geo: ",
-)
-
 # Default timeout values (seconds).
 # MiniMate Plus is a slow device — keep these generous.
 DEFAULT_RECV_TIMEOUT = 10.0
@@ -631,13 +617,9 @@ class MiniMateProtocol:
                     break
                 raise
 
-            # Detect metadata frame using the same multi-needle set used by
-            # _decode_a5_waveform.  Devices with no Project/Client/etc.
-            # configured omit those label strings; b"Geo: " is the fallback.
-            _is_metadata = any(n in rsp.data for n in _METADATA_FRAME_NEEDLES)
             log.warning(
-                "5A RX chunk=%d page_key=0x%04X data_len=%d is_metadata=%s",
-                chunk_num, rsp.page_key, len(rsp.data), _is_metadata,
+                "5A RX chunk=%d page_key=0x%04X data_len=%d contains_Project=%s",
+                chunk_num, rsp.page_key, len(rsp.data), b"Project:" in rsp.data,
             )
 
             if rsp.page_key == 0x0000:
@@ -647,7 +629,7 @@ class MiniMateProtocol:
 
             frames_data.append(rsp.data)
 
-            if stop_after_metadata and _is_metadata:
+            if stop_after_metadata and b"Project:" in rsp.data:
                 log.debug("5A A5[%d] metadata found — stopping early", chunk_num)
                 break
         else: