feat: Introduce pydantic conversion for schemas

[Claude]

Motivation

Closes #323.

Changes

• Add to_pydantic_model on dy.Schema

Side-note: GitHub-orchestrated Claude was really unhelpful 🫠

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (f5de4fc) to head (a5a8280).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

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##              main      #324    +/-   ##
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  Coverage   100.00%   100.00%            
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  Files           56        56            
  Lines         3233      3399   +166     
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+ Hits          3233      3399   +166     

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[Oliver Borchert (borchero)]

@claude[agent] implement all review comments

[Oliver Borchert (borchero)]

@claude[agent] implement the review comment

[Copilot]

Pull request overview

Adds first-class Pydantic v2 support to Dataframely schemas/columns to enable generating structured-output models (e.g., for LLM constrained decoding) directly from dy.Schema.

Changes:

• Add Schema.to_pydantic_model() to generate a pydantic.BaseModel reflecting schema columns and structured constraints.
• Introduce Column.pydantic_field() plus per-column _python_type / _pydantic_field_kwargs() implementations to translate constraints into Pydantic annotations.
• Add an optionals-only test suite covering pydantic field generation and basic schema-to-model conversion.

Reviewed changes

Copilot reviewed 19 out of 19 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
tests/schema/test_pydantic_model.py	Tests for Schema.to_pydantic_model() behavior (basic fields, validation, warning on schema rules).
tests/columns/test_pydantic.py	Tests for Column.pydantic_field() across many column types and constraints/warnings.
dataframely/schema.py	Implements Schema.to_pydantic_model() using pydantic.create_model.
dataframely/columns/_base.py	Adds Column.pydantic_field(), _python_type abstract property, and _pydantic_field_kwargs() hook.
dataframely/columns/_mixins.py	Adds _pydantic_field_kwargs() to OrdinalMixin to translate min/max constraints.
dataframely/columns/any.py	Defines _python_type for Any to support pydantic type generation.
dataframely/columns/array.py	Adds _python_type and pydantic length constraints for arrays (incl. multidim warning).
dataframely/columns/binary.py	Defines _python_type for binary columns.
dataframely/columns/bool.py	Defines _python_type for bool columns.
dataframely/columns/categorical.py	Defines _python_type for categorical columns.
dataframely/columns/datetime.py	Defines _python_type and warnings for non-translatable datetime/date/time/duration constraints.
dataframely/columns/decimal.py	Defines _python_type and pydantic decimal-place constraint.
dataframely/columns/enum.py	Defines _python_type using Literal[...] for category validation.
dataframely/columns/float.py	Defines _python_type and pydantic constraints for bounds/inf/nan handling (incl. warning).
dataframely/columns/integer.py	Defines _python_type and pydantic constraints for integer bounds and is_in.
dataframely/columns/list.py	Defines _python_type and pydantic min/max length constraints for lists.
dataframely/columns/object.py	Defines _python_type for object columns.
dataframely/columns/string.py	Defines _python_type and pydantic length/pattern constraints for strings.
dataframely/columns/struct.py	Defines _python_type as an inner pydantic model for struct validation.