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---

core/regression_verify.py

@@ -180,7 +180,7 @@ def _check_resolver_microservice() -> Tuple[Status, str]:
 
 def _check_adapter_emits_terraform() -> Tuple[Status, str]:
     """CAP-005: terraform adapter compiles a resolved stack to .tf files."""
-    work = tempfile.mkdtemp(prefix="acdl_regr_")
+    work = tempfile.mkdtemp(prefix="nova_regr_")
     stack_path = os.path.join(work, "stack.json")
     tf_dir = os.path.join(work, "tf")
     os.makedirs(tf_dir, exist_ok=True)
@@ -211,7 +211,7 @@ def _check_interpolation() -> Tuple[Status, str]:
         "import sys; sys.path.insert(0,'.'); "
         "from core.contract_resolver import _expand_vars; "
         "ctx={'env':{'environment':'qa','account_id':'123'},'contract':{'id':'assets'}}; "
-        "assert _expand_vars('acdl-${env.environment}-${contract.id}', ctx)=='acdl-qa-assets'; "
+        "assert _expand_vars('nova-${env.environment}-${contract.id}', ctx)=='nova-qa-assets'; "
         "print('interpolation ok')",
     ])
 
@@ -231,7 +231,7 @@ def _check_confidence_signal() -> Tuple[Status, str]:
 
 def _check_outbox_writer() -> Tuple[Status, str]:
     """CAP-008: outbox_writer writes a hash-chained event to a temp file."""
-    work = tempfile.mkdtemp(prefix="acdl_outbox_")
+    work = tempfile.mkdtemp(prefix="nova_outbox_")
     event_path = os.path.join(work, "event.json")
     event = {
         "contractId": "regression-test", "eventType": "CONFIDENCE_COMPUTED",
@@ -315,7 +315,7 @@ def _load_aws_env() -> Dict[str, str]:
                     continue
                 if "=" in line:
                     k, v = line.split("=", 1)
-                    # P5 (REQ-164): dual-read fallback removed — NOVA_* only.
+                    # NOVA_* only (ACDL_* fallback removed in v1.15 P5, REQ-164).
                     if k == "NOVA_AWS_ACCESS_KEY_ID":
                         env["AWS_ACCESS_KEY_ID"] = v
                     elif k == "NOVA_AWS_SECRET_ACCESS_KEY":
@@ -330,7 +330,7 @@ def _check_live_terraform_plan_microservice() -> Tuple[Status, str]:
     microservice stack (D-093 live-AWS tier of the headline E2E).
 
     Requires AWS credentials (NOVA_AWS_ACCESS_KEY_ID etc. in .env.secrets;
-    dual-read NOVA_* first, ACDL_* fallback per G-106).
+    NOVA_* only — the ACDL_* fallback was removed in v1.15 P5, REQ-164).
     Runs in a temp dir; does NOT apply (plan only)."""
     import tempfile, os
     work = tempfile.mkdtemp(prefix="nova_regr_live_")