Publish Vulpes Preview 15 sources for desktop, Android and Tundra

Share Gaia assets and adapters, keep private profiles and development documents local, and update both public READMEs.

host/actors/TouchChild.sys.mjs

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+// Reuse Gecko's own responsive-design touch implementation. No application
+// gets privileged input methods; only physical mouse events are transformed.
+export class VulpesTouchChild extends JSWindowActorChild {
+  handleEvent() {
+    if (Services.cpmm.sharedData.get('vulpes:native-touch')) return;
+    const allowed = Services.cpmm.sharedData.get('vulpes:host-contexts') || [];
+    if (!allowed.includes(this.browsingContext.top.id) || this.simulator) return;
+    const { require } = ChromeUtils.importESModule(
+      'resource://devtools/shared/loader/Loader.sys.mjs',
+    );
+    const { TouchSimulator } = require('devtools/server/actors/emulation/touch-simulator');
+    this.simulator = new TouchSimulator({ chromeEventHandler: this.contentWindow, emit() {} });
+    this.simulator.start();
+    this.contentWindow.addEventListener('contextmenu', (event) => event.preventDefault(), true);
+  }
+  receiveMessage(message) {
+    if (message.name !== 'Vulpes:CancelTouch') throw new Error('METHOD_NOT_SUPPORTED');
+    this.contentWindow.synthesizeTouchEvent('touchcancel', message.data, 0, {
+      isAsyncEnabled: true,
+    });
+    return true;
+  }
+  didDestroy() {
+    try {
+      this.simulator?.stop();
+    } catch (_) {}
+  }
+}