docs(android): M8 step 1 built — API 36, the bundle and the Play upload

Records what Android-app's feat/m8-google-play builds and how it was
checked, raises target/compile SDK to 36 in §2 and §13, describes the
Play step in §12, and lists the console and Cloud setup the org lead
does before CI's first upload.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01E14m6SuuY6i1vASFeGDBeY

android/PLAN.md

@@ -494,7 +494,7 @@ Native, Android-only:
 | Live feed | OkHttp SSE (`EventSource`) for `/public/shard/stream` |
 | Images | Coil |
 | Min SDK | **Android 10 (API 29)** — ~95% device reach with a modern baseline (biometric, storage, TLS) and no compat shims |
-| Target/compile SDK | Latest stable (35) |
+| Target/compile SDK | Latest stable (36, Android 16: Google Play's floor since 2026-08-31; M8) |
 | Telemetry | **None in v1** — no crash/analytics SDK (privacy-first). Revisit self-hosted crash reporting later. |
 | Localization | **Strings externalized from day one** (`res/values/strings.xml`); English is the only bundled locale, but the structure invites community translations. No hardcoded UI strings. |
 | Web hand-off | Chrome Custom Tabs — opens the website for registration / invite / password reset / SSO (§4.2) |
@@ -966,6 +966,30 @@ push, and Play (M6–M8) follow the designed app.
    **Order of work:**
    1. **App + CI** (one PR into `edge`): API 36 + AGP bump, AAB, Play upload step. Walked on the
       emulator and the S22 before the PR.
+
+      **Built 2026-10-23.** AGP 8.13.2 (the last 8.x; 9.x changes the DSL) with the Gradle 8.14.3
+      wrapper; Kotlin, KSP and Hilt unchanged. AGP 8.13 still defaults to build-tools 35.0.0, so
+      the workflows only add `platforms;android-36`. The code had none of Android 16's hotspots:
+      no edge-to-edge opt-out, no `onBackPressed` override (Navigation Compose takes predictive
+      back), no orientation lock. The bundle goes on the Gitea release as well, which is where
+      step 2's hand upload takes it from. Checks: the debug gate (unit tests, lint, debug build)
+      passes; a release APK and bundle built with a throwaway keystore carry the same
+      certificate, `targetSdkVersion 36`, versionCode 601; the Play step ran against a mock of
+      the token and Play endpoints in `ubuntu:latest` (JWT signature checked against the key's
+      public half; success, a rejected token, a refused upload, a refused commit, a mismatched
+      versionCode, and an unset secret). Walked on an Android 16 emulator (API 36.1): connect,
+      sign in as admin, notification settings saved, edge-swipe back, Rust servers, Dashboard,
+      no crash; the minified release build refuses `http` and survives a TLS round trip. On the
+      `s22_ultra` emulator (API 35) the build updates in place, connects and opens the menu. Not
+      walked: the push foreground service (the walk site has no ntfy), and a signed-in release
+      build (no local HTTPS site); the internal-track install in step 2 covers both.
+
+      **Before the first CI upload (org lead, by hand):** in Google Cloud, a service account
+      with a JSON key, and the Google Play Android Developer API enabled; in Play Console →
+      Users and permissions, invite the service account's address with release rights on this
+      app only; then the whole JSON file as the `PLAY_SERVICE_ACCOUNT_JSON` secret on
+      `RunicGateway/Android-app`. Until a release has been rolled out by hand (step 2), Play
+      refuses CI's upload with "Only releases with status draft may be created on draft app".
    2. **First bundle**, uploaded by hand from the next tag, with the signing key enrolled.
    3. **Console declarations**: target audience 18+ (runicgateway.com D31), advertising ID none,
       data safety from runicgateway.com's generated `PLAY_DATA_SAFETY.md`, and sign-in details
@@ -2051,6 +2075,14 @@ repos use), on a bare `ubuntu:latest` container.
   Gitea release (mirrors `link/`'s release job). The **keystore is a base64 Gitea Actions secret**
   decoded in CI; store/key passwords are secrets. The keystore never lives in the repo. Keep the
   signing identity stable from the first release (Play later requires consistency).
+- **Google Play** (M8, same workflow): the keystore also signs an app bundle (`bundleRelease`),
+  attached to the Gitea release beside the APK. After the Gitea release exists, the bundle goes to
+  Play's **internal** track through the Play Developer API v3 edit flow (open an edit → upload the
+  bundle → set the internal track → commit), with an OAuth token from a service-account JWT signed
+  by `openssl`. The key is the `PLAY_SERVICE_ACCOUNT_JSON` secret; while it is unset, the step
+  warns and skips. The step runs last, so a Play failure fails the run without holding back the
+  APK. Play rejects a `completed` release on an app that has never rolled one out ("Only releases
+  with status draft may be created on draft app"); the first bundle is therefore uploaded by hand.
 - Semantic `versionName` + monotonic `versionCode`; tag releases.
 
 ### 12.1 Code quality — SonarQube (`Runic-Gateway-Android-app`)
@@ -2084,7 +2116,7 @@ Compose/nav cognitive-complexity + hoisted-callback param-count smells (idiomati
 
 **Decided (recorded here for context):** single shard per install (§3); native auth is
 password+TOTP only, with registration/invite/reset/SSO **handled by the website** (§4); **password
-reset built on backend + web first**, before app work (§8); minSdk 29, compile/target 35 (§2); no
+reset built on backend + web first**, before app work (§8); minSdk 29, compile/target 36 (§2, raised from 35 at M8); no
 telemetry in v1 (§2); strings externalized from day one, English-only bundled (§2); **text-only** game
 data in v1, pretty paperdoll is future (§6.3); **no offline cache in v1** (§7); push via self-hosted
 ntfy / UnifiedPush (§11) with the **distributor embedded in the app — no second app to install**