- Resolve device_id via query_keys({mxid: []}) when whoami() returns None
- Guard _verify_device_keys_on_server and _reverify_keys_after_upload
against None/unverified device_id to prevent 'device_keys values must
be a list of strings' serialization failure
- Disconnect existing client before reconnect to prevent dual OlmMachine
instances on the same crypto store
Re-targeted from #39779 (legacy gateway/platforms/matrix.py) onto the
migrated plugins/platforms/matrix/adapter.py path following the
2026-06-20 adapter migration. Logic unchanged from original fix.
242 tests passing (233 upstream + 9 new).
9048457eab