Status: IN
Two-pointer techniques are a structural variant of single-pass streaming using paired cursors: they share streaming's core properties (monotonic progress, O(1) state, single traversal) but generalize the scan by allowing convergent or divergent cursor movement, making them streaming algorithms with a richer cursor model.
both patterns share monotonic-progress + O(1)-state invariants; two-pointer adds a second cursor axis
Depends on (SL): two-pointer-primary-linear-array-technique, single-pass-streaming-dominant-shape