docs(milestone): complete v1.15 — Nova Rebrand (tag v1.15.4)

P5 final-review-ship complete: dual-read fallback removed (REQ-164) —
core/env.py NOVA-only, .env.secrets load paths NOVA-only (G-106 retired),
nova_tagging.py hard-fails any acdl:* tag, legacy ACDL_* Gitea secrets
deleted, ACDL_LIFECYCLE_MODE/ACDL_LOCAL_TIER/ACDL_HITL_* exports removed
from scripts, SNS subject → Nova SoD halt (P1-2), bootstrap scripts
NOVA-only. Review: 2 P0 auto-fixed (duplicate delenv), P1-1/P1-2 resolved,
doc-drift fixed. Audit: tags v1.15.0-4 exist; traceability REQ-155..164
all complete; ARCHITECTURE naming table matches codebase. 615 pytest PASS;
run_ci.sh 3-stage PASS. NOVA_MIGRATION.md marked COMPLETE.

---ci---
project: acdl
phase: 5
milestone: v1.15
status: complete
phase_role: final
requirements:
  covered: [REQ-155, REQ-156, REQ-157, REQ-158, REQ-159, REQ-160, REQ-161, REQ-162, REQ-163, REQ-164]
  partial: []
---/ci---

scripts/run_l2_lifecycle_destroy.sh

@@ -4,7 +4,7 @@
 # Usage: run_l2_lifecycle_destroy.sh <module>
 #
 # Wraps run_platform.sh for L2 composition modules in the modules-lifecycle
-# pipeline. Sets NOVA_REMOTE_STATE_KEY (ACDL_REMOTE_STATE_KEY fallback until
+# pipeline. Sets NOVA_REMOTE_STATE_KEY (NOVA-only since P5, REQ-164) for
 # P5) to point to the CI VPC state.
 #
 # NOTE: unlike the L1 scripts (run_lifecycle_destroy.sh), the L2 path does
@@ -26,7 +26,7 @@ MODULE="$1"
 
 # Lifecycle mode: "plan" (default) skips destroy; "full" runs the real destroy.
 # Dual-read: NOVA_* preferred, ACDL_* fallback (removed in P5).
-LIFECYCLE_MODE="${NOVA_LIFECYCLE_MODE:-${ACDL_LIFECYCLE_MODE:-plan}}"
+LIFECYCLE_MODE="${NOVA_LIFECYCLE_MODE:-plan}"
 
 if [ "$LIFECYCLE_MODE" != "full" ]; then
   echo "lifecycle mode=$LIFECYCLE_MODE — nothing to destroy (plan-only run), exiting 0"
@@ -38,7 +38,7 @@ CONTRACT="modules/l2/${MODULE}/examples/complex.yml"
 # Point terraform_remote_state to the CI VPC state (not the platform VPC).
 # Set both NOVA_* (preferred) and ACDL_* (legacy fallback) until P5.
 export NOVA_REMOTE_STATE_KEY="spike/ci-vpc/terraform.tfstate"
-export ACDL_REMOTE_STATE_KEY="spike/ci-vpc/terraform.tfstate"  # legacy fallback, removed in P5
+
 
 # Run the platform lifecycle destroy command
 bash scripts/run_platform.sh --destroy "$CONTRACT"