chore(release): v0.4.15 — the app can finally tell you it is out of date

Carries the two AGE-110 mechanisms: the in-app update check (#179) and the
first release whose tag push publishes straight to Play production (#177).

Co-Authored-By: Paperclip <noreply@paperclip.ing>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@opencode-ai/mobile",
-  "version": "0.4.14",
+  "version": "0.4.15",
   "private": true,
   "main": "expo-router/entry",
   "scripts": {