fix: add web-probe screenshot and tighten sentinel dashboard

scripts/src/hwlab-node-help.ts

@@ -43,6 +43,8 @@ export function hwlabNodeWebProbeHelp(): Record<string, unknown> {
       "bun scripts/cli.ts web-probe run --node D601 --lane v03 --wait-messages-ms 1000",
       "bun scripts/cli.ts web-probe run --node D601 --lane v03 --fresh-session --message 'ping'",
       "bun scripts/cli.ts web-probe script --node D601 --lane v03 --script-file .state/probes/workbench.mjs",
+      "bun scripts/cli.ts web-probe screenshot --node D601 --lane v03 --url https://monitor.pikapython.com --viewport 1440x900",
+      "bun scripts/cli.ts web-probe screenshot --node D601 --lane v03 --url https://monitor.pikapython.com --viewport 390x844 --name monitor-mobile.png",
       "bun scripts/cli.ts web-probe observe start --node D601 --lane v03 --target-path /workbench --sample-interval-ms 5000",
       "bun scripts/cli.ts web-probe observe start --node D601 --lane v03 --target-path /projects/mdtodo --sample-interval-ms 5000",
       "bun scripts/cli.ts web-probe observe command webobs-xxxx --type sendPrompt --text 'ping'",
@@ -58,6 +60,7 @@ export function hwlabNodeWebProbeHelp(): Record<string, unknown> {
     actions: {
       run: "Run the repo-owned scripts/web-live-dom-probe.mjs helper.",
       script: "Run caller-provided Playwright JS after CLI-managed /auth/login; scripts must not handle secrets themselves.",
+      screenshot: "Capture a no-auth or public page through the selected node/lane remote browser and download PNG artifacts to the caller /tmp by default.",
       observe: "Start, inspect, control, stop, collect, and analyze a long-running observer that writes JSONL artifacts.",
       sentinel: "Render and operate the YAML-first web-probe sentinel wrapper, image, GitOps, maintenance and report views.",
     },