Fix noodlemagazine thumb proxy; check.py verifies proxied urls

The thumb proxy dropped the preview query string, rejected extensionless
getVideoPreview paths and warmed up through the slow fallback chain on
every image. check.py now verifies that a proxied video.url resolves
instead of failing it outright.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MUYdCh2nCVsQYgJAT7gwSi

check.py

@@ -354,7 +354,29 @@ def check_video(video: dict, channel_id: str, results: Results, run_ytdlp: bool)
     if not vurl:
         results.err(channel_id, f"{label}: missing url")
     elif "127.0.0.1" in vurl or "localhost" in vurl:
-        results.err(channel_id, f"{label}: url points to hottub server: {vurl}")
+        # A proxied video.url is legitimate when the page itself cannot be
+        # played directly (see the hottub skill: "if a video URL requires a
+        # server-side proxy, set it as the video URL"). Verify that it
+        # actually resolves instead of rejecting it outright.
+        resolved_vurl = follow_proxy_redirect(vurl)
+        if resolved_vurl and resolved_vurl != vurl:
+            ok, code = http_ok(resolved_vurl)
+            target = resolved_vurl
+        else:
+            ok, code = http_ok(vurl)
+            target = vurl
+        if ok:
+            results.info(channel_id, f"{label}: proxied url OK (HTTP {code})")
+        elif _is_cf_protected(target):
+            results.warn(
+                channel_id,
+                f"{label}: proxied url target unreachable HTTP={code} (CF-protected host, expected): {vurl}",
+            )
+        else:
+            results.err(
+                channel_id,
+                f"{label}: proxied url does not resolve (HTTP={code}, target {target[:120]}): {vurl}",
+            )
     else:
         ok, code = http_ok(vurl)
         if not ok: