feat: modernize ActiveModel integration with backward compatibility

[seuros]

Support legacy syntax.

[Copilot]

Pull Request Overview

This PR modernizes the ActiveModel integration to support both legacy positional hash initializers and new keyword argument syntax while preserving backward compatibility.

• Adds compatibility tests for positional hashes, keyword args, empty initialization, and attribute aliases
• Updates the generated initialize helper to accept params = nil, **kwargs and dispatch correctly
• Ensures positional arguments take precedence when both styles are provided

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
test/machine_initialization_compatibility_test.rb	New tests covering legacy and keyword initialization modes, empty init, attribute aliases, and precedence rules
lib/state_machines/integrations/active_model.rb	Refactored define_state_initializer to handle positional and keyword args and forward them to super

Comments suppressed due to low confidence (1)

lib/state_machines/integrations/active_model.rb:356

• [nitpick] The parameter name kwargs is less common in Ruby; consider renaming it to keyword_params for clarity and consistency with Ruby naming conventions.

          def initialize(params = nil, **kwargs)

[Copilot]

Using params || kwargs will treat an empty params hash as present and ignore keyword args even when they have values. Consider using attrs = params.nil? ? kwargs : params to explicitly check for an absent positional argument.

Suggested change

	attrs = params || kwargs
	attrs = params.nil? ? kwargs : params