Update shared Gaia workflows and Sargo development tooling

Fix camera switching and Contacts/SMS activity routing across shared hosts.
Integrate Marketplace installation and native standalone recovery tools,
Bluetooth runtime packages and trusted certificates.

Update English/French READMEs and the shared changelog with tested scope
and remaining radio/audio/Bluetooth limitations. Preview17 remains the
existing APK; no new native image is released.

Validation: shared JavaScript and native Python tests; Android packaging
and payload parity from an isolated publication checkout.

android/extension/content.js

@@ -1,6 +1,6 @@
 /* Extension world: the browser provides origin/tab/frame identity, never Gaia. */
 (() => {
-  if (location.port !== '18765') return;
+  if (location.port !== '18765' || location.hostname.startsWith('user-')) return;
   const win = window.wrappedJSObject;
   console.info('VULPES Android bridge', location.origin);
   let port;