kettle-rb / ast-merge / 20815529402

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✨ Ast::Merge::EmitterBase

### Added

- `Ast::Merge::EmitterBase` - Abstract base class for format-specific emitters
  - Provides common infrastructure for converting AST structures back to text
  - Tracks indentation level with configurable `indent_size` (default: 2 spaces)
  - Manages output lines collection with `#lines` accessor
  - `#emit_blank_line` - Emit an empty line
  - `#emit_leading_comments` - Emit comments from CommentTracker
  - `#emit_raw_lines` - Emit lines without modification (preserves exact formatting)
  - `#to_s` - Get output as a single string with trailing newline
  - `#clear` - Reset emitter state
  - `#indent` / `#dedent` - Increase/decrease indentation level
  - Subclass hooks: `#initialize_subclass_state`, `#clear_subclass_state`, `#emit_tracked_comment`
  - Used by jsonc-merge, json-merge, bash-merge, toml-merge, and psych-merge emitters

### Changed

- tree_haver v4.0.0

794 of 886 branches covered (89.62%)

Branch coverage included in aggregate %.

3 of 4 new or added lines in 2 files covered. (75.0%)

2465 of 2544 relevant lines covered (96.89%)

31.29 hits per line