Log route count on boot and no-match on route attempts

Shows "pages: N routes loaded" at startup and
"sx:route no match (N routes) /path" when no route matches,
so we can see if routes loaded and why matching fails.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

shared/sx/ref/boot.sx

@@ -319,7 +319,8 @@
                         (merge page
                           {"parsed" (parse-route-pattern (get page "path"))})))
                     pages))))))
-        scripts))))
+        scripts)
+      (log-info (str "pages: " (len _page-routes) " routes loaded")))))
 
 
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