[chipkent]

Preview only. This is a draft in the fork showing the exact text of the PR planned for massive-com/client-python. It will be closed, not merged, once the upstream PR is opened.

Fixes #<issue: F4b>

@modelclass builds each model's __init__ at runtime, so type checkers cannot see it and reject every keyword argument:

$ mypy -c 'from massive.rest.models import LastTrade
LastTrade(ticker="AAPL", price=1.5)'
<string>:2: error: Unexpected keyword argument "ticker" for "LastTrade"  [call-arg]
<string>:2: error: Unexpected keyword argument "price" for "LastTrade"  [call-arg]

With this PR the same command prints Success: no issues found.

• Marks modelclass with dataclass_transform (PEP 681), so checkers derive the constructor from the field annotations.
• The decorator is imported only under TYPE_CHECKING: from typing on 3.11+, from typing_extensions on 3.10. At runtime it is a no-op, so no dependency is added and 3.10 keeps working.
• No unit test: the change is invisible at runtime, and make static does not check untyped test bodies. The mypy run above shows the effect.

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