fix: pin Aider binary for portal canary

scripts/run-memind-portal-candidate.sh

@@ -40,6 +40,7 @@ export MEMIND_DEEPSEEK_NO_THINK_PORT="${MEMIND_CANARY_DEEPSEEK_PROXY_PORT:-18036
 export MEMIND_GOOSED_HOST_GATEWAY=host.docker.internal
 export H5_WECHAT_MP_PAGE_DATA_AIDER_REVIEW_ENABLED="${MEMIND_CANARY_WECHAT_PAGE_DATA_AIDER_REVIEW_ENABLED:-0}"
 export H5_WECHAT_MP_PAGE_DATA_AIDER_REVIEW_USERS="${MEMIND_CANARY_WECHAT_PAGE_DATA_AIDER_REVIEW_USER_IDS:-}"
+export AIDER_BIN="${MEMIND_CANARY_AIDER_BIN:-/opt/homebrew/bin/aider}"
 unset MEMIND_DEEPSEEK_NO_THINK_BASE_URL
 unset MEMIND_DEEPSEEK_NO_THINK_HOST
 unset TKMIND_API_TARGET_1
@@ -48,6 +49,10 @@ NODE_BIN="${NODE_BIN:-/opt/homebrew/opt/node@24/bin/node}"
 if [[ ! -x "${NODE_BIN}" ]]; then
   NODE_BIN="$(command -v node)"
 fi
+if [[ "${H5_WECHAT_MP_PAGE_DATA_AIDER_REVIEW_ENABLED}" == "1" && ! -x "${AIDER_BIN}" ]]; then
+  echo "[portal-candidate] configured Aider executable is unavailable: ${AIDER_BIN}" >&2
+  exit 1
+fi
 
 port="${H5_PORT}"
 if lsof -tiTCP:"${port}" -sTCP:LISTEN >/dev/null 2>&1; then