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.

tests/installed_apps_test.py

@@ -0,0 +1,28 @@
+import base64
+import json
+from pathlib import Path
+import sys
+import tempfile
+import unittest
+sys.path.insert(0, str(Path(__file__).resolve().parents[1]/'tools'))
+from installed_apps import InstalledApps
+
+class StoreTests(unittest.TestCase):
+    def test_persistence_removal_and_permission_boundary(self):
+        with tempfile.TemporaryDirectory() as folder:
+            store=InstalledApps(folder,8765)
+            item=dict(id='user-'+'1'*24,manifest=dict(name='Test',type='certified',permissions={'settings':{}}),files={'index.html':base64.b64encode(b'hello').decode()})
+            store.save(item)
+            restored=InstalledApps(folder,8765)
+            self.assertEqual(restored.read(item['id'],'index.html'),b'hello')
+            self.assertEqual(restored.records()[0]['manifest']['permissions'],{})
+            self.assertEqual(restored.records()[0]['manifest']['type'],'web')
+            self.assertEqual(json.loads(restored.read(item['id'],'manifest.webapp'))['permissions'],{})
+            self.assertEqual((Path(folder)/'.token').stat().st_mode & 0o777,0o600)
+            self.assertIsNone(restored.read(item['id'],'../.token'))
+            with self.assertRaises(ValueError):restored.remove('system')
+            with self.assertRaises(ValueError):restored.save({**item,'id':'../escape'})
+            restored.remove(item['id'])
+            self.assertEqual(InstalledApps(folder,8765).records(),[])
+
+if __name__=='__main__':unittest.main()