Merge condition evidence without repeated copies

docs/roadmap/implementation.md

@@ -444,6 +444,12 @@ rendering comparisons. Source work counts or focused measurements demonstrate
 removal of the identified growing-copy pattern; no grammar or expression limit
 changes, universal complexity promise, or allocation-count assertion is added.
 
+Completion: owned condition sets merge smaller into larger without retaining
+operand snapshots. For the documented distinct left-heavy cases, source work is
+3, 15, and 127 insertions at N=4, 16, and 128, respectively, excluding leaf
+creation (previously 9, 135, and 8,255). Prompt requirements tests pass on Go
+1.27.3; these counts are not a general complexity guarantee.
+
 ## Stage 17: Share Requirement Branch Orchestration
 
 **Catalog:** 23. **Files:** internal prompt requirement traversal/evaluation.