Hetzner checks answer again; failed checks go to the console (closes #114)

The Hetzner speed-test servers close the connection without an answer
when the URL has a query string, and every check added ?_cb= and the
time, so all six showed unreachable. Checks now fetch each target's URL
as written; cache: "no-store" still keeps the browser's cache out of the
measurement.

Each recorded check that fails writes one console.error line, and the
same line to the debug log: the target's name and URL, the time, what
failed and how long the request took. A target that answers after
failed checks writes one console.info line. Checks the page does not
record write nothing, so the debug log no longer lists failures in the
first round or the recovery probe.

Model: opus-5-5

TODO.md

@@ -22,6 +22,17 @@ Decide whether the repo moves to the layout `REPO_POLICIES.md` gives, with
 
 # Completed Steps
 
+- 2026-10-07: the six Hetzner targets answer again, and failed checks are
+  written to the browser console
+  ([#114](https://git.eeqj.de/sneak/netwatch/issues/114)). The Hetzner
+  speed-test servers close the connection without an answer when the URL has a
+  query string, and every check added `?_cb=` and the time; checks now fetch
+  each target's URL as written, with `cache: 'no-store'` as before. Each
+  recorded check that fails writes one `console.error` line, and the same line
+  to the debug log, with the target's name and URL, the time, what failed and
+  how long the request took; a target that answers after failed checks writes
+  one `console.info` line. Checks the page does not record write none, so the
+  debug log no longer lists failures in the first round or in the recovery probe
 - 2026-10-04: the page's footer no longer says "IPv4 only"
   ([#111](https://git.eeqj.de/sneak/netwatch/issues/111)): each check is a
   `fetch`, the browser picks IPv4 or IPv6 for each WAN host, and the local