py: make session reset an API setup helper

### CHANGELOG.md
@@ -10,6 +10,7 @@ recorded separately.
 - Reject malformed microSD backups instead of crashing
 - Hold the screen reset pin low until firmware is ready initalize it.
 - Cardano: limit xpub requests to 20 keypaths per batch
+- API: add a session reset command for clean host reconnects after interrupted operations
 
 ### v9.27.1
 - API: include the installed bootloader version in the device info response

### py/bitbox02/bitbox02/communication/bitbox_api_protocol.py
@@ -302,18 +302,6 @@ def __init__(self, transport: TransportLayer):
     def close(self) -> None:
         self._transport.close()
 
-    def reset_session(self) -> None:
-        """Reset the previous session before attestation, unlock and the Noise handshake."""
-        cid = self._transport.generate_cid()
-        while True:
-            response = self._transport.query(HwwRequestCode.REQ_RESET, HWW_CMD, cid)
-            if response == HwwResponseCode.RSP_BUSY:
-                time.sleep(1)
-                continue
-            if response != HwwResponseCode.RSP_ACK:
-                raise Exception("Unexpected response to RESET.")
-            return
-
     def _raw_query(self, msg: bytes) -> bytes:
         cid = self._transport.generate_cid()
         return self._transport.query(msg, HWW_CMD, cid)
@@ -612,8 +600,7 @@ def __init__(
         else:
             self._bitbox_protocol = BitBoxProtocolV1(transport)
 
-        if self.version >= semver.VersionInfo(9, 28, 0):
-            self._bitbox_protocol.reset_session()
+        self._reset_session(transport, self.version)
 
         if self.version >= semver.VersionInfo(2, 0, 0):
             noise_config.attestation_check(self._perform_attestation())
@@ -711,6 +698,24 @@ def reboot(
             return False
         return True
 
+    @staticmethod
+    def _reset_session(transport: TransportLayer, version: semver.VersionInfo) -> None:
+        """Reset the previous session before attestation, unlock and the Noise handshake.
+
+        Skip firmware older than v9.28.0, which does not support session reset.
+        """
+        if version < semver.VersionInfo(9, 28, 0):
+            return
+        cid = transport.generate_cid()
+        while True:
+            response = transport.query(HwwRequestCode.REQ_RESET, HWW_CMD, cid)
+            if response == HwwResponseCode.RSP_BUSY:
+                time.sleep(1)
+                continue
+            if response != HwwResponseCode.RSP_ACK:
+                raise Exception("Unexpected response to RESET.")
+            return
+
     @staticmethod
     def get_info(
         transport: TransportLayer,

### py/bitbox02/tests/test_session.py
@@ -5,6 +5,8 @@
 import unittest
 from unittest import mock
 
+import semver
+
 from bitbox02.communication import bitbox_api_protocol as protocol
 from bitbox02.communication.communication import TransportLayer
 from bitbox02.communication.devices import BITBOX02MULTI
@@ -74,7 +76,9 @@ def test_reset_session_busy(self) -> None:
             protocol.HwwResponseCode.RSP_ACK,
         ]
         with mock.patch.object(protocol.time, "sleep") as sleep:
-            protocol.BitBoxProtocolV7(transport).reset_session()
+            protocol.BitBoxCommonAPI._reset_session(  # pylint: disable=protected-access
+                transport, semver.VersionInfo(9, 28, 0)
+            )
         sleep.assert_called_once_with(1)
         self.assertEqual(
             transport.query.call_args_list,
@@ -88,7 +92,9 @@ def test_reset_session_requires_ack(self) -> None:
                 transport = mock.Mock(spec=TransportLayer)
                 transport.query.return_value = response
                 with self.assertRaisesRegex(Exception, "Unexpected response to RESET"):
-                    protocol.BitBoxProtocolV7(transport).reset_session()
+                    protocol.BitBoxCommonAPI._reset_session(  # pylint: disable=protected-access
+                        transport, semver.VersionInfo(9, 28, 0)
+                    )
 
 
 if __name__ == "__main__":