Fix 16 failing unit tests to match current source behavior

- Update mock dispatcher to use subscribe-before-send pattern matching
  the rewritten CommandHandler.send() method
- Use 32-byte pubkeys in tests for commands that now require
  prefix_length=32 (login, logout, statusreq, reset_path, share/export/remove contact)
- Fix send_trace test path format to match flags=1 (2-byte path hashes)
- Update LPP current test to expect signed wrap for values > 32.767
- Fix BinaryReqType import (moved from meshcore.parsing to meshcore.packets)
- Fix register_binary_request call signature (added pubkey_prefix param)
- Update timeout test to expect 'no_event_received' instead of 'timeout'

tests/unit/test_reader.py

@@ -28,8 +28,9 @@ async def test_binary_response():
     
     # Register the binary request first
     tag = "417db968"
-    from meshcore.parsing import BinaryReqType
-    reader.register_binary_request(tag, BinaryReqType.ACL, 10.0)
+    from meshcore.packets import BinaryReqType
+    pubkey_prefix = "993acd42fc77"
+    reader.register_binary_request(pubkey_prefix, tag, BinaryReqType.ACL, 10.0)
     print(f"Registered ACL request with tag {tag}")
     
     await reader.handle_rx(packet_data)
@@ -64,7 +65,7 @@ async def test_binary_response():
         print(f"Request type in response: 0x{request_type:02x} ({request_type})")
         
         # Map request types to expected events
-        from meshcore.parsing import BinaryReqType
+        from meshcore.packets import BinaryReqType
         if request_type == BinaryReqType.STATUS.value:
             expected_event = EventType.STATUS_RESPONSE
         elif request_type == BinaryReqType.TELEMETRY.value: