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d3eb2296e7
Fixes #37835 --- When Pydantic collects fields for a `BaseLanguageModel` subclass that defines a `dict()` method, inherited annotations can resolve `dict` against the subclass namespace instead of the builtin. With Pydantic 2.14.0a1 this caused `BaseLanguageModel.metadata: dict[str, Any] | None` to fail during rebuild/import with `'function' object is not subscriptable`. This qualifies the inherited `metadata` field annotation as `builtins.dict[...]`, matching the existing pattern in chat models, and documents why the runtime import cannot move behind `TYPE_CHECKING`. It also adds a regression test that rebuilds a `BaseLanguageModel` subclass with a `dict()` method so core catches this failure before partner packages hit it at import time. Related to #37924, which hardens `_create_subset_model_v2`; this PR fixes the `BaseLanguageModel` class-construction failure directly.