Release v0.3.2

This release introduces a key structural update to the Variable model, improving clarity, validation, and YAML contract expressiveness. It also includes a full rewrite of the README.rst for better readability and consistency with the updated architecture.

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What's Changed

Variable model refactor

• Replaced the previous dictionary-style variable declaration with a list of Variable objects.
• Each variable now includes:
  • name: variable identifier
  • value: literal value (int, str, float, bool, None)
  • annotation: optional type annotation, validated at runtime
• Introduced Variable.from_variable_info() for metadata transformation.
• Type annotations are validated against a defined list of supported types.

YAML contract structure update

• Contracts must now define variables as a list of structured objects.
• Example:

variables:
  - name: engine
    value: docker
    annotation: str