kettle-rb / tree_haver / 20890570373 / 1

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💥 BREAKING CHANGES; new features; fixes; more specs

### Added

- **Shared Example Groups for Backend API Compliance Testing**
  - `node_api_examples.rb` - Tests for Node API compliance:
    - `"node api compliance"` - Core Node interface (type, start_byte, end_byte, children)
    - `"node position api"` - Position API (start_point, end_point, start_line, end_line, source_position)
    - `"node children api"` - Children traversal (#child, #first_child, #last_child)
    - `"node enumerable behavior"` - Enumerable methods (#each, #map, #select, #find)
    - `"node comparison behavior"` - Comparison and equality (#==, #<=>, #hash)
    - `"node text extraction"` - Text content (#text, #to_s)
    - `"node inspection"` - Debug output (#inspect)
  - `tree_api_examples.rb` - Tests for Tree API compliance:
    - `"tree api compliance"` - Core Tree interface (root_node, source, errors, warnings, comments)
    - `"tree error handling"` - Error detection (#has_error?, #errors)
    - `"tree traversal"` - Depth-first traversal via root_node
  - `parser_api_examples.rb` - Tests for Parser API compliance:
    - `"parser api compliance"` - Core Parser interface (#parse, #parse_string, #language=)
    - `"parser incremental parsing"` - Incremental parsing support
    - `"parser error handling"` - Error recovery behavior
  - `language_api_examples.rb` - Tests for Language API compliance:
    - `"language api compliance"` - Core Language interface (#backend, #name/#language_name)
    - `"language comparison"` - Comparison and equality
    - `"language factory methods"` - Factory methods (.from_library, .from_path)
  - `backend_api_examples.rb` - Tests for Backend module API compliance:
    - `"backend module api"` - Backend availability and capabilities
    - `"backend class structure"` - Nested class verification
    - `"backend integration"` - Full parse cycle testing
  - `spec/support/shared_examples.rb` - Master loader for all shared examples
  - `spec/integration/ba... (continued)

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