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/settings-codec.test.mjs

@@ -0,0 +1,35 @@
+import test from 'node:test';
+import assert from 'node:assert/strict';
+import vm from 'node:vm';
+import {readFileSync} from 'node:fs';
+
+const context = {window:{}, Blob, Date, btoa, atob, Uint8Array};
+vm.runInNewContext(readFileSync(new URL('../host/settings-codec.js',import.meta.url),'utf8'),context);
+const codec=context.window.VulpesSettingsCodec;
+test('native media replies retain the structured-cloned Blob and date', async()=>{
+  const blob=new Blob(['jpeg bytes'],{type:'image/jpeg'}), date=new Date();
+  const result=codec.decode({blob,lastModified:date});
+  assert.equal(result.blob,blob);
+  assert.equal(result.lastModified,date);
+  assert.equal(await result.blob.text(),'jpeg bytes');
+});
+test('Android JSON media and settings still round-trip binary content',async()=>{
+  const source=new Blob([new Uint8Array([0,128,255,10])],{type:'image/png'});
+  const wire=JSON.parse(JSON.stringify(await codec.encode({photo:source})));
+  const result=codec.decode(wire);
+  assert.equal(result.photo.type,'image/png');
+  assert.deepEqual(new Uint8Array(await result.photo.arrayBuffer()),new Uint8Array([0,128,255,10]));
+});
+test('a near-match marker is ordinary data, not an injected Blob',()=>{
+  const result=codec.decode({__vulpesBlobV1:true,type:'image/png',base64:'AA==',other:1});
+  assert.equal(result.other,1);
+  assert.equal(result instanceof Blob,false);
+});
+
+test('Android contact birthdays keep their ISO date instead of becoming empty objects',async()=>{
+  const date=new Date('1995-08-19T00:00:00.000Z');
+  const wire=await codec.encode({bday:date,photo:[new Blob(['portrait'],{type:'image/jpeg'})]});
+  const result=codec.decode(JSON.parse(JSON.stringify(wire)));
+  assert.equal(result.bday,date.toISOString());
+  assert.equal(await result.photo[0].text(),'portrait');
+});