Fix from_chemeleon=True throwing error#544
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Move backwards-compatibility logic for from_chemeleon → from_foundation from __init__ into a @model_validator(mode='before') classmethod, which is the idiomatic Pydantic v2 pattern for pre-processing input data before fields are assigned. - Add handle_from_chemeleon_compat pre-validator that emits a DeprecationWarning and translates from_chemeleon=True to from_foundation='chemeleon' before field assignment - Remove compat if-blocks from __init__, which now only tracks _explicit_init_fields - Mark from_chemeleon as deprecated in the docstring - Add test for happy-path compat (from_chemeleon=True → from_foundation) - Add test asserting DeprecationWarning is emitted Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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Description
Fix error where if you just set from_chemeleon=True, you hit error.
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