diff --git a/cmd/hwlab-gateway/main.ts b/cmd/hwlab-gateway/main.ts
index 582e6e1b..2433dcae 100644
--- a/cmd/hwlab-gateway/main.ts
+++ b/cmd/hwlab-gateway/main.ts
@@ -15,6 +15,7 @@ const pollIntervalMs = parsePositiveInteger(process.env.HWLAB_GATEWAY_POLL_INTER
 const commandTimeoutMs = parsePositiveInteger(process.env.HWLAB_GATEWAY_CMD_TIMEOUT_MS, 120000);
 const outputLimitBytes = parsePositiveInteger(process.env.HWLAB_GATEWAY_CMD_OUTPUT_LIMIT_BYTES, 65536);
 const maxInflightRequests = parsePositiveInteger(process.env.HWLAB_GATEWAY_MAX_INFLIGHT, 3);
+// CI probe: touches only the hwlab-gateway code identity for env reuse validation.
 const gatewayEnvironment = normalizeEnvironment(process.env.HWLAB_ENVIRONMENT || process.env.HWLAB_GITOPS_PROFILE || ENVIRONMENT_DEV);
 const resourceId = process.env.HWLAB_GATEWAY_RESOURCE_ID ?? "res_windows_host";
 const boxId = process.env.HWLAB_GATEWAY_BOX_ID ?? "box_windows_host";