diff --git a/scripts/install.sh b/scripts/install.sh
index c9d7879..eee3c98 100755
--- a/scripts/install.sh
+++ b/scripts/install.sh
@@ -700,18 +700,22 @@ resolve_build_target() {
 install_config_template() {
   local template="$1"
   local dest="$2"
-  local src modern legacy
+  local src legacy
+  local -a modern_candidates=()
+  local -a legacy_candidates=()
 
-  modern="configs/ananke.${template}.yaml"
   case "${template}" in
     coordinator)
-      legacy="configs/hecate.titan-db.yaml"
+      modern_candidates=("configs/ananke.coordinator.yaml" "configs/ananke.titan-db.yaml")
+      legacy_candidates=("configs/hecate.titan-db.yaml")
       ;;
     peer)
-      legacy="configs/hecate.tethys.yaml"
+      modern_candidates=("configs/ananke.peer.yaml" "configs/ananke.tethys.yaml")
+      legacy_candidates=("configs/hecate.tethys.yaml")
       ;;
     example)
-      legacy="configs/hecate.example.yaml"
+      modern_candidates=("configs/ananke.example.yaml")
+      legacy_candidates=("configs/hecate.example.yaml")
       ;;
     *)
       echo "[install] unknown config template key: ${template}" >&2
@@ -719,21 +723,24 @@ install_config_template() {
       ;;
   esac
 
-  if [[ -f "${modern}" ]]; then
-    src="${modern}"
-    install -m 0640 "${src}" "${dest}"
-    return 0
-  fi
+  for src in "${modern_candidates[@]}"; do
+    if [[ -f "${src}" ]]; then
+      install -m 0640 "${src}" "${dest}"
+      return 0
+    fi
+  done
 
-  if [[ -f "${legacy}" ]]; then
-    src="$(mktemp)"
-    legacy_path_rewrite "${legacy}" "${src}"
-    install -m 0640 "${src}" "${dest}"
-    rm -f "${src}"
-    return 0
-  fi
+  for legacy in "${legacy_candidates[@]}"; do
+    if [[ -f "${legacy}" ]]; then
+      src="$(mktemp)"
+      legacy_path_rewrite "${legacy}" "${src}"
+      install -m 0640 "${src}" "${dest}"
+      rm -f "${src}"
+      return 0
+    fi
+  done
 
-  echo "[install] missing both modern and legacy config templates for '${template}'." >&2
+  echo "[install] missing config template sources for '${template}'. modern=[${modern_candidates[*]}] legacy=[${legacy_candidates[*]}]" >&2
   return 1
 }
 
diff --git a/scripts/quality_gate.sh b/scripts/quality_gate.sh
index 55fafd3..06a6490 100755
--- a/scripts/quality_gate.sh
+++ b/scripts/quality_gate.sh
@@ -105,6 +105,9 @@ cd "${REPO_DIR}"
 echo "[quality] lint"
 ./scripts/lint.sh
 
+echo "[quality] installer template contracts"
+./scripts/verify_install_templates.sh
+
 echo "[quality] per-file coverage gate (95%)"
 cd testing
 ANANKE_ENFORCE_COVERAGE=1 ANANKE_PER_FILE_COVERAGE_TARGET=95 go test ./coverage -run TestPerFileCoverageReport -count=1 -v
diff --git a/scripts/verify_install_templates.sh b/scripts/verify_install_templates.sh
new file mode 100755
index 0000000..c15ee91
--- /dev/null
+++ b/scripts/verify_install_templates.sh
@@ -0,0 +1,40 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+REPO_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+cd "${REPO_DIR}"
+
+check_template() {
+  local template="$1"
+  shift
+  local found=""
+  local candidate
+  for candidate in "$@"; do
+    if [[ -f "${candidate}" ]]; then
+      found="${candidate}"
+      break
+    fi
+  done
+
+  if [[ -z "${found}" ]]; then
+    echo "[template-contract] ${template}: no candidate exists: $*" >&2
+    return 1
+  fi
+
+  echo "[template-contract] ${template}: ${found}"
+  return 0
+}
+
+check_template coordinator \
+  "configs/ananke.coordinator.yaml" \
+  "configs/ananke.titan-db.yaml" \
+  "configs/hecate.titan-db.yaml"
+
+check_template peer \
+  "configs/ananke.peer.yaml" \
+  "configs/ananke.tethys.yaml" \
+  "configs/hecate.tethys.yaml"
+
+check_template example \
+  "configs/ananke.example.yaml" \
+  "configs/hecate.example.yaml"