- AVL SequenceSet: sparse sequence set with AVL tree, 16 tests - Subject Tree: Adaptive Radix Tree (ART) with 5 node tiers, 59 tests - Generic Subject List: trie-based subject matcher, 21 tests - Time Hash Wheel: O(1) TTL expiration wheel, 8 tests Total: 106 new tests (1,081 → 1,187 passing)