Tune health check cadence: 15s request timeout, 5s poll interval

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: anth-volk

.github/scripts/health_check.sh

@@ -4,8 +4,8 @@ set -euo pipefail
 
 health_url="${1:?health check URL is required}"
 timeout_seconds="${HEALTH_CHECK_TIMEOUT_SECONDS:-900}"
-interval_seconds="${HEALTH_CHECK_INTERVAL_SECONDS:-10}"
-curl_max_time_seconds="${HEALTH_CHECK_CURL_MAX_TIME_SECONDS:-10}"
+interval_seconds="${HEALTH_CHECK_INTERVAL_SECONDS:-5}"
+curl_max_time_seconds="${HEALTH_CHECK_CURL_MAX_TIME_SECONDS:-15}"
 deadline=$((SECONDS + timeout_seconds))
 
 while (( SECONDS < deadline )); do