Add inherited dataclass annotation validation

[trissim]

What changed

• add a reusable AnnotatedDataclassValidationMixin
• preserve validation when dataclasses are recreated from their nominal bases
• release the change as 0.1.7

Why

Annotated Python types are the runtime schema. Dataclass declarations need one generic lifecycle hook instead of repeating per-field or per-package validation code.

Validation

• 99 passed

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Review completed with 1 suggestions.

[augmentcode]

This inherited hook is incompatible with dataclasses that declare InitVar fields because dataclasses pass each InitVar value into __post_init__; with this zero-argument signature those classes fail during construction before validation runs. That makes the mixin unusable for a supported dataclass feature even though it is intended as a generic lifecycle hook.

Severity: medium

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