cluster0: sync ac-workspace and url-shortener on lab deploy

Add deploy-ac-workspace, deploy-ac-url-shortener, validate-ac-repos;
wire into populate app phase and verify_lab_setup.

Co-authored-by: Cursor <cursoragent@cursor.com>

sim/cluster0/scripts/validate-ac-repos.sh

@@ -0,0 +1,56 @@
+#!/bin/sh
+# Validate ac-workspace + legacy runtime on this cluster node.
+set -eu
+ROOT="$(cd "$(dirname "$0")/.." && pwd)"
+# shellcheck source=/dev/null
+. "$ROOT/scripts/lib/common.sh"
+load_cluster_env
+
+FAIL=0
+check_dir() {
+  _label="$1"
+  _path="$2"
+  if [ -d "$_path" ]; then
+    log "OK ${_label} ${_path}"
+  else
+    log "FAIL missing ${_label} ${_path}"
+    FAIL=1
+  fi
+}
+
+check_file() {
+  _label="$1"
+  _path="$2"
+  if [ -f "$_path" ]; then
+    log "OK ${_label}"
+  else
+    log "FAIL missing ${_label} ${_path}"
+    FAIL=1
+  fi
+}
+
+AC_ROOT="${AC_WORKSPACE_ROOT:-/var/www/ac/workspace}"
+LEGACY="${APP_ROOT}/android_cast"
+
+log "validate-ac-repos on $(host_short)"
+check_dir "ac-workspace" "$AC_ROOT"
+check_dir "ac-platform-db" "${AC_ROOT}/ac-platform-db/sql/crash_reporter"
+check_dir "ac-platform-php" "${AC_ROOT}/ac-platform-php/src"
+check_dir "ac-platform-web" "${AC_ROOT}/ac-platform-web/assets/css"
+check_dir "legacy-monolith" "$LEGACY"
+check_file "legacy-backend" "${LEGACY}/examples/crash_reporter/backend/public/index.php"
+check_dir "url-shortener" "${URL_SHORTENER_ROOT:-/var/www/url-shortener}/public"
+
+if [ -d "${AC_ROOT}/.git" ]; then
+  log "ac-workspace_sha=$(git -C "$AC_ROOT" rev-parse --short HEAD 2>/dev/null || echo none)"
+fi
+if [ -d "${LEGACY}/.git" ]; then
+  log "legacy_sha=$(git -C "$LEGACY" rev-parse --short HEAD 2>/dev/null || echo none)"
+fi
+
+if [ "$FAIL" -eq 0 ]; then
+  log "validate-ac-repos_ok"
+  exit 0
+fi
+log "validate-ac-repos_FAILED"
+exit 1