kettle-rb / ast-merge / 20649563244

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✨ `Ast::Merge::NodeWrapperBase` abstract base class for format-specific node wrappers

- Provides common functionality shared by `*::Merge::NodeWrapper` classes across gems
- Handles source context (lines, source string), line info, comments, content extraction
- Defines abstract `#compute_signature` that subclasses must implement
- Includes `#node_wrapper?` to distinguish from `NodeTyping::Wrapper`
- Includes `#underlying_node` to access the raw TreeHaver node (NOT `#unwrap` to avoid
    conflict with `NodeTyping::Wrapper#unwrap` semantics in `FileAnalyzable`)
- Documents relationship between `NodeWrapperBase` and `NodeTyping::Wrapper`:
- `NodeWrapperBase`: Format-specific functionality (line info, signatures, type predicates)
- `NodeTyping::Wrapper`: Custom merge classification (`merge_type` attribute)
- Nodes can be double-wrapped: `NodeTyping::Wrapper(Format::Merge::NodeWrapper(tree_sitter_node))`
- Accepts `**options` in initialize for subclass-specific parameters (e.g., `backend`, `document_root`)

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