chore: Add protocol snapshot tests for the mqtt and local e2e tests.

[allenporter]

Update the local tests to send the exact same binary format for the initial hello requests. This also adds L01 coverage.

[Copilot]

Pull request overview

This PR adds protocol snapshot tests for the MQTT and local end-to-end tests to ensure binary protocol compatibility. The changes make the local tests send deterministic binary messages for initial hello requests, enabling regression testing of the wire protocol format. Additionally, L01 protocol coverage is added.

• Adds snapshot testing infrastructure using syrupy for MQTT and local e2e tests
• Updates local tests to use deterministic message generation for consistent binary snapshots
• Adds comprehensive L01 protocol test coverage including handshake fallback

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
tests/mqtt_fixtures.py	Updates Subscriber type annotations to support both RoborockMessage and bytes
tests/e2e/test_mqtt_session.py	Adds snapshot assertions to existing MQTT session tests
tests/e2e/test_local_session.py	Refactors local session tests with snapshot support and adds new L01 protocol test
tests/e2e/snapshots/test_mqtt_session.ambr	New snapshot file capturing MQTT protocol binary exchanges
tests/e2e/snapshots/test_local_session.ambr	New snapshot file capturing local protocol binary exchanges including L01
tests/conftest.py	Adds logging to FakeSocketHandler to capture requests/responses for snapshots
roborock/protocol.py	Makes ack_nonce parameter optional in _l01_aad and encrypt_gcm_l01 functions

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