Drop legacy JSON protocol support

[puddly]

#3 brought support for Ziggurat's binary protocol while adding a transparent shim to support the provisional JSON format. It's been a few releases and I think anybody using Ziggurat would have updated their Ziggurat addon a few times by now. It's time we remove the backwards compat.

[Copilot]

🟢 Approval recommended

The only remaining finding is a non-blocking test-coverage nit.

Pull request overview

Removes legacy JSON WebSocket protocol support, leaving binary protocol transport only.

Changes:

• Removes legacy transport models and tests.
• Removes the mashumaro dependency and lockfile entries.
• Updates transport tests for binary frames and handler errors.

Review note: Add coverage rejecting the former JSON text hello; this is a non-blocking nit.

File summaries

File	Description
zigpy_ziggurat/zigbee/transport.py	Restricts transport to binary frames.
zigpy_ziggurat/zigbee/legacy.py	Removes legacy JSON models.
uv.lock	Updates locked dependencies.
tests/test_transport.py	Updates binary transport coverage.
tests/test_legacy.py	Removes obsolete legacy tests.
pyproject.toml	Removes mashumaro.

Review details

Suppressed comments (1)

zigpy_ziggurat/zigbee/transport.py:180

• The legacy-removal behavior is not covered by the updated transport tests: they only exercise a binary hello and a closing handshake. Please add a server/test case that sends the former JSON text hello and asserts connect_transport() rejects it, so the compatibility boundary is protected against accidental reintroduction or incorrect handshake handling.

    if hello.type != aiohttp.WSMsgType.BINARY:

• Files reviewed: 5/6 changed files
• Comments generated: 0
• Review effort level: Lite

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (c92f735) to head (dabb663).

Additional details and impacted files

@@            Coverage Diff             @@
##               dev        #7    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files            7         6     -1     
  Lines         1681      1185   -496     
==========================================
- Hits          1681      1185   -496     

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