verify(P3): dead-code-and-stale-prefix-cleanup — 4-layer verify PASS + ship

VERIFY: structural — dead export + stale comments + prefixes gone; behavioral — 616 tests + CI PASS; quality — env-override test updated.

---ci---
project: acdl
phase: 3
milestone: v1.16
status: complete
phase_role: execution
requirements:
  covered: [REQ-167]
  partial: []
---/ci---

scripts/run_primitive_plan.sh

@@ -26,7 +26,7 @@ done
 INSTANCE="modules/l1/$PRIMITIVE/instance.json"
 [ -f "$INSTANCE" ] || { echo "FAIL: no instance.json for primitive '$PRIMITIVE'" >&2; exit 1; }
 
-WORK="/tmp/acdl_primitive_plan_$PRIMITIVE"
+WORK="/tmp/nova_primitive_plan_$PRIMITIVE"
 rm -rf "$WORK"; mkdir -p "$WORK"
 
 echo "=== Primitive plan: $PRIMITIVE ==="