Merge remote-tracking branch 'upstream/main' into feat/opensky-compress-cached-body

main renamed the flights proxy mount from /api/opensky to /api/flights. Git
took the new mount cleanly but left this branch's own tests and notes on the
old path, and the compression test then failed. They now use /api/flights.

src/tooling/responseCompression.test.mjs

@@ -10,7 +10,7 @@ import {
 /** A request shaped like the one Node hands a middleware. */
 function request(acceptEncoding) {
   return {
-    url: '/api/opensky',
+    url: '/api/flights',
     method: 'GET',
     headers:
       acceptEncoding === undefined ? {} : { 'accept-encoding': acceptEncoding },