xint-runtime-data-written-to-release-dir-not-persistent-path

xint writes runtime data (api-costs.json, reliability-metrics.json) to an internal data/ dir inside the release folder by default, not to the configured persistent path. Fix by symlinking releases/<version>/data → /opt/infra/xint/data/ immediately after installation. Without this symlink, all cost tracking and reliability metrics are lost on every version upgrade.