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.

tundra/tools/install-sargo.py

@@ -23,6 +23,8 @@ def load(name, path):
 def checked_build(folder):
     folder=Path(folder).resolve()
     build=json.loads((folder/'build.json').read_text())
+    if build.get('storageMode') in ('raw-userdata-ext4', 'container-test'):
+        raise ValueError('Use the standalone installer; the old boot-only plan is incompatible')
     if build.get('localDebugger'):raise ValueError('Diagnostic debugger image cannot be flashed')
     qualification=json.loads((folder/'qualification.json').read_text())
     if (not qualification.get('passed') or not qualification.get('privateInstallReady')