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.

services/screen-power.mjs

@@ -0,0 +1,28 @@
+// Preserve power transitions; coalesce brightness steps while hardware is busy.
+export class ScreenPower {
+  constructor(state, apply) {
+    this.state = state;
+    this.apply = apply;
+    this.pending = Promise.resolve();
+    this.tail = null;
+  }
+  set(name, value) {
+    if (name === 'screenBrightness' && this.tail?.name === name && !this.tail.started) {
+      this.tail.value = value;
+      return this.tail.promise;
+    }
+    const queued = {name, value, started:false};
+    const operation = this.pending.then(async () => {
+      queued.started = true;
+      if (this.tail === queued) this.tail = null;
+      const next = {...this.state, [name]:queued.value};
+      await this.apply(next, name);
+      Object.assign(this.state, next);
+      return {...this.state};
+    });
+    queued.promise = operation;
+    this.tail = queued;
+    this.pending = operation.catch(() => {});
+    return operation;
+  }
+}