0.2.2 - dynamic storage resolution

[bnlucas]

No breaking changes – the public DSL (cattri, final_cattri) remains identical to v0.2.0.

Removed

• Removed Cattri::AttributeRegistry#copy_attributes_to and all associated logic. Subclass attribute propagation
  is now handled entirely via runtime resolution in Context#storage_receiver_for, eliminating the need for eager
  copying of attribute values or metadata.
• Removed Cattri::Inheritance and its use of .inherited hooks for subclass propagation, since all relevant state
  is now derived dynamically.

Changed

• Replaced static subclass propagation with dynamic storage resolution using Context#storage_receiver_for,
  which now determines the correct backing object (instance, class, or singleton class) for all reads and writes.
• AttributeCompiler.define_accessor now uses storage_receiver_for to set final class-level attribute values
  during compilation.
• Final class-level attributes (final: true, scope: :class) are now evaluated and written directly to the correct
  storage receiver without relying on prior duplication logic.

Added

• Proper support for defining attributes directly on a module’s singleton_class, ensuring values are stored and
  accessed consistently across runtime and functional tests.

  module MyModule
    class << self
      include Cattri
  
      cattri :version, "0.1.0", final: true, scope: :class
    end
  end

• Regression tests ensuring:
  • Subclass attribute shadowing works for final: true, scope: :class.
  • Instance and class attribute isolation behaves as expected across inheritance chains.
  • No mutation of final attributes once defined.
• Test coverage for Context#storage_receiver for and Context#resolve_class_storage_for across all branching logic.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (7f535bd) to head (0c55ea4).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main        #8   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           15        14    -1     
  Lines          364       374   +10     
  Branches        49        56    +7     
=========================================
+ Hits           364       374   +10     

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