Slate v2 Op-family Fourteenth Slice

Supporting plan. For current queue and roadmap truth, see master-roadmap.md.

Goal

• Land the exact-path structural counterpart to wrapNodes(...): a narrow unwrapNodes(...) cut.

Scope

• Start with exact path-based unwrapping only.
• Avoid match/mode/split parity in this slice.

Phases

• Confirm the exact path unwrap semantics and current structural seams
• Write focused failing tests
• Implement the smallest honest core/API slice
• Sync package/public docs
• Verify the touched package/docs