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_lifecycle_destroy.sh

@@ -6,8 +6,8 @@
 # For VPC-dependent modules, injects CI VPC outputs into the complex contract
 # before destroy (so terraform can find the resources in the right VPC).
 #
-# Lifecycle mode (REQ-134): NOVA_LIFECYCLE_MODE (dual-read NOVA_* preferred,
-# ACDL_* fallback until P5) default "plan" = no-op
+# Lifecycle mode (REQ-134): NOVA_LIFECYCLE_MODE (NOVA_* only; ACDL_*
+# fallback removed in v1.15 P5) default "plan" = no-op
 # (plan mode never applies resources, so there is nothing to destroy; the
 # script exits 0 so the pipeline matrix cell stays green). Set to "full"
 # for the real `--destroy` against live AWS.
@@ -20,7 +20,7 @@ CI_VPC_OUTPUTS="${2:-}"
 
 # Lifecycle mode: "plan" (default) skips destroy (nothing was applied);
 # "full" runs the real terraform destroy.
-# Dual-read: NOVA_* preferred, ACDL_* fallback (removed in P5).
+# NOVA_* env vars only (ACDL_* fallback removed in v1.15 P5, REQ-164).
 LIFECYCLE_MODE="${NOVA_LIFECYCLE_MODE:-plan}"
 
 if [ "$LIFECYCLE_MODE" != "full" ]; then
@@ -33,7 +33,7 @@ CONTRACT="modules/l1/${MODULE}/examples/complex.yml"
 VPC_DEPENDENT="alb ecs-service rds uptime"
 
 if echo "$VPC_DEPENDENT" | grep -qw "$MODULE" && [ -n "$CI_VPC_OUTPUTS" ] && [ -f "$CI_VPC_OUTPUTS" ]; then
-  TMP_CONTRACT="/tmp/acdl-lifecycle-${MODULE}-complex.yml"
+  TMP_CONTRACT="/tmp/nova-lifecycle-${MODULE}-complex.yml"
   python3 -c "
 import yaml, json