feat: add runner conversion scripts and strengthen cutover automation

runners-conversion/periodVault/validate-sdd.sh

@@ -0,0 +1,58 @@
+#!/usr/bin/env bash
+# validate-sdd.sh
+# Ensures changed spec folders keep mandatory SDD artifacts.
+set -euo pipefail
+
+BASE_REF="${1:-origin/main}"
+
+if ! git rev-parse --verify "$BASE_REF" >/dev/null 2>&1; then
+  BASE_REF="HEAD~1"
+fi
+
+CHANGED_SPEC_FILES=()
+while IFS= read -r line; do
+  [[ -n "$line" ]] && CHANGED_SPEC_FILES+=("$line")
+done < <(git diff --name-only "$BASE_REF"...HEAD -- 'specs/**')
+
+if [[ ${#CHANGED_SPEC_FILES[@]} -eq 0 ]]; then
+  echo "[validate-sdd] No changes under specs/."
+  exit 0
+fi
+
+SPEC_DIRS=()
+add_unique_dir() {
+  local candidate="$1"
+  local existing
+  for existing in "${SPEC_DIRS[@]:-}"; do
+    [[ "$existing" == "$candidate" ]] && return 0
+  done
+  SPEC_DIRS+=("$candidate")
+}
+
+for path in "${CHANGED_SPEC_FILES[@]}"; do
+  if [[ "$path" =~ ^specs/[^/]+/ ]]; then
+    spec_dir="$(echo "$path" | cut -d/ -f1-2)"
+    add_unique_dir "$spec_dir"
+  fi
+done
+
+if [[ ${#SPEC_DIRS[@]} -eq 0 ]]; then
+  echo "[validate-sdd] PASS (no feature spec directories changed)"
+  exit 0
+fi
+
+FAILED=0
+for dir in "${SPEC_DIRS[@]}"; do
+  for required in spec.md plan.md tasks.md allowed-files.txt; do
+    if [[ ! -f "$dir/$required" ]]; then
+      echo "[validate-sdd] Missing required file: $dir/$required"
+      FAILED=1
+    fi
+  done
+done
+
+if [[ $FAILED -ne 0 ]]; then
+  exit 1
+fi
+
+echo "[validate-sdd] PASS ($BASE_REF...HEAD)"