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/runtime/mark-boot-success.py

@@ -0,0 +1,38 @@
+#!/usr/bin/env python3
+# SPDX-License-Identifier: MPL-2.0
+"""Acknowledge slot A only after this standalone installation has started Gaia."""
+import json
+from pathlib import Path
+import subprocess
+import time
+
+
+def eligible(boot_id, gaia, mount, cmdline, services_ready):
+    return (cmdline.get('androidboot.slot_suffix') == '_a'
+            and mount.get('source') == '/dev/mmcblk0p72'
+            and mount.get('fstype') == 'ext4'
+            and gaia.get('bootId') == boot_id and gaia.get('passed') is True
+            and bool(gaia.get('checks')) and all(gaia['checks'].values())
+            and services_ready)
+
+
+def main():
+    cmdline=dict(x.split('=',1) for x in Path('/proc/cmdline').read_text().split() if '=' in x)
+    boot_id=Path('/proc/sys/kernel/random/boot_id').read_text().strip()
+    mounts=json.loads(subprocess.check_output(['findmnt','--json','--mountpoint','/reference/tundra-volume','--output','SOURCE,FSTYPE'],text=True))['filesystems']
+    if len(mounts)!=1 or mounts[0]['source']!='/dev/mmcblk0p72':
+        return  # Container/RAM experiments must not mark a flashed slot successful.
+    for _ in range(120):
+        try:
+            gaia=json.loads(Path('/opt/vulpes/logs/test.json').read_text())
+            ready=subprocess.run(['systemctl','is-active','--quiet','tundra-hal','tundra-display','tundra-radio']).returncode==0
+            if eligible(boot_id,gaia,mounts[0],cmdline,ready):break
+        except (OSError,ValueError):pass
+        time.sleep(5)
+    else:raise RuntimeError('Gaia did not pass startup; slot success left unchanged')
+    subprocess.run(['/usr/libexec/tundra-qbootctl','-m','a'],check=True)
+    Path('/var/lib/tundra').mkdir(parents=True,exist_ok=True)
+    Path('/var/lib/tundra/boot-success.json').write_text(json.dumps({'bootId':boot_id,'gaiaPassed':True,'slot':'a'})+'\n')
+
+
+if __name__=='__main__':main()