chore(tasks): summaries + oai11 completion for wave-1 merges

tasks/adapters/review-002-oai11-ref-memoization.md

@@ -1,7 +1,7 @@
 ---
 id: review-002-oai11-ref-memoization
 name: Memoize $ref expansion to bound resolver work (OAI-11)
-status: pending
+status: completed
 depends_on: []
 scope: moderate
 risk: medium
@@ -67,4 +67,8 @@ exponential re-resolution, not allocation). If memoizing, note the
 active cycle attempt must never be cached (write-on-success at the
 top of the recursion return path, or post-order). This is the one
 subtle part; the existing cycle tests + the four new shape tests are
-the safety net.
+the safety net.
+
+## Summary
+
+Memoized $ref expansion (write-on-success cache) + node-budget accounting on memo hits + separate MAX_REF_HOP_DEPTH (64) from structural depth (128). Exponential diamond chains now fail with a clean budget error (<1s) instead of OOM. Note: the original WIP's unbounded memo-hit clone OOM-killed the dev server twice during implementation; verified under a 2G systemd scope.