integration: add native-app/README.md

native-app/README.md

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+# Native App Module — Website as an App
+
+Integrates the Sovereign website with native surfaces:
+
+| Surface | What it is | Where |
+|---|---|---|
+| **PWA** | Installable app — manifest + service worker, app-shell cache | `site/manifest.webmanifest` · `site/sw.js` |
+| **Android shell** | Dark WebView wrapper over the site (`dashboard_url` string resource) | `builds/apk/app/src/main/.../MainActivity.kt` |
+| **iOS shell** | Native wrapper over the site | `builds/ios/` |
+| **Web UI** | Chat + storefront pages served by the same site | `site/chat.html` · `site/store.html` |
+
+## PWA
+
+- `site/manifest.webmanifest` — standalone display, brand theme
+  (`#0B1020` bg / `#0FA3A3` theme), PEC5D logo icon, shortcuts to
+  dashboard/chat/PEC5D.
+- `site/sw.js` — cache-first app shell; API paths bypass the cache
+  (network-first data).
+- `site/index.html` links the manifest + registers the service worker.
+
+Install from any browser: "Install app" (Android Chrome / iOS Safari
+"Add to Home Screen").
+
+## Android shell (builds/apk)
+
+`MainActivity.kt` is a dark WebView (`#0A0A10` bg, `#00E5FF` accent)
+loading `R.string.dashboard_url` — point that resource at the production
+site (or staging) and every site page (dashboard, chat, pec5d, store)
+is available in-app. `BubbleService.kt` / `SovereignWidget.kt` provide
+the floating chat bubble and home-screen widget surfaces.
+
+> Android builds run on GitHub runners (no local SDK). See the
+> cross-platform build/publish skill + `builds/apk/README`.
+
+## Config
+
+`config/native-app.yaml` — PWA + shell settings (see module doc).
+
+## Verify PWA
+
+```bash
+python3 -c "import json; d=json.load(open('site/manifest.webmanifest')); print('manifest OK:', d['name'])"
+# sw.js is plain JS — no build step; served from site/ root scope
+```