game-engines: allegro5/bullet3/box2d/dry CWE-407 scan

bullet3-0001: btGhostObject::addOverlappingObjectInternal O(N²) linear dedup
  per broadphase step — even carries "too slow" self-admission comment (HIGH)
bullet3-0002: btSoftRigidCollisionAlgorithm::processCollision O(C×D) per
  frame on m_collisionDisabledObjects plain array (MEDIUM)
allegro5: CLEAN (vector_contains only on non-hot setup paths)
box2d: CLEAN (v3 rewrite uses b2HashSet throughout)
dry: CLEAN (HashSet/HashMap on all hot dedup paths)

defects/bottle/patch/CLEAN.md

@@ -0,0 +1,15 @@
+# bottle — CWE-407 Scan: CLEAN
+
+Scanned: 2026-03-29
+
+## Scope
+
+- `bottle.py` — Route.all_plugins(): dedup via `unique = set()`
+- Plugin installation/removal: list traversal with no membership dedup inside
+  hot loops
+- Route matching: trie-based router, no list membership checks
+
+## Verdict
+
+No CWE-407 (algorithmic complexity / quadratic membership check) defects found.
+Plugin name deduplication uses `set`. No visited/seen lists in traversal paths.