- Replaced string-based chunk naming with type-safe ChunkKind enum across 35+ AST classifier modules.
- Refactored ChunkNode to use optional identifier and ChunkKind instead of name string for semantic clarity.
- Created new kind.rs module with ChunkKind enum (150+ variants) and trait-based metadata system.
- Removed string prefix-based chunk type detection and replaced with ChunkKind enum matching throughout.
- Updated chunk API signatures to accept ChunkKind and optional identifier instead of formatted names.
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