clice/openspec/changes/split-folding-range-pipeline/tasks.md

1. Raw Model and Collector Boundary

• 1.1 Introduce internal raw folding-range and render-option types while keeping the current folding entrypoint stable.
• 1.2 Convert the existing AST structural folding path in src/feature/folding_ranges.cpp to emit raw ranges instead of final LSP ranges.
• 1.3 Add regression fixtures or assertions that cover the currently supported structural fold categories before further refactoring.

2. Normalization and Rendering

• 2.1 Implement normalization for deterministic sorting, duplicate removal, and invalid-range filtering.
• 2.2 Introduce a dedicated renderer that converts normalized ranges into final LSP folding-range objects.
• 2.3 Keep default rendered output compatible with current structural behavior while exposing extension points for future collectors and render rules.

3. Verification

• 3.1 Compare pre-refactor and post-refactor outputs for the existing structural folding test cases.
• 3.2 Run relevant folding-range unit tests and fix any ordering, deduplication, or boundary regressions introduced by the new pipeline.