diff --git a/.gitignore b/.gitignore
index 79f7eca..3aad8c4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -46,3 +46,7 @@ app.*.map.json
 
 # Widget Preview related
 .widget_preview/
+
+# Build artifacts (large; regenerable)
+build/
+.dart_tool/
diff --git a/android/app/build.gradle.kts b/android/app/build.gradle.kts
index 92c2bdd..ae44eb3 100644
--- a/android/app/build.gradle.kts
+++ b/android/app/build.gradle.kts
@@ -6,7 +6,7 @@ plugins {
 
 android {
     namespace = "com.rippr"
-    compileSdk = flutter.compileSdkVersion
+    compileSdk = 37
     ndkVersion = flutter.ndkVersion
 
     compileOptions {
@@ -19,8 +19,8 @@ android {
         applicationId = "com.rippr.port"
         // You can update the following values to match your application needs.
         // For more information, see: https://flutter.dev/to/review-gradle-config.
-        minSdk = flutter.minSdkVersion
-        targetSdk = flutter.targetSdkVersion
+        minSdk = 26          // parity with the native app (Android 8.0)
+        targetSdk = 36
         // Uses the version code from pubspec.yaml. When using split APKs, 1000 * ABI_VERSION
         // is added automatically by Flutter. (https://developer.android.com/studio/build/configure-apk-splits#configure-APK-versions)
         // You can force using the value of versionCode by specifying the `-P force-version-code-ignoring-abi=true`
diff --git a/docs/port/PROGRESS.md b/docs/port/PROGRESS.md
index 90d0cea..7253857 100644
--- a/docs/port/PROGRESS.md
+++ b/docs/port/PROGRESS.md
@@ -57,6 +57,58 @@ validation in T25: record the same ride on both simultaneously and compare the n
 The Android `namespace` stays `com.rippr` and the Kotlin source was moved from
 `kotlin/com/rippr/rippr/` to `kotlin/com/rippr/` to match.
 
+### Builds verified on both platforms
+
+`✓ build/ios/iphonesimulator/Runner.app` and `✓ build/app/outputs/flutter-apk/app-debug.apk`.
+
+Android needed three changes to the generated `build.gradle.kts`:
+
+```kotlin
+compileSdk = 37      // a dependency demands it; the build fails outright on 36
+minSdk     = 26      // parity with the native app (Android 8.0)
+targetSdk  = 36
+```
+
+`sdkmanager` cannot fetch `platforms;android-37` from the stable channel — it reports
+"Failed to find package". **AGP installed it automatically** during the build (as
+`android-37.0`), along with CMake 3.22.1 and a 2.8 GB NDK, because the licences had
+already been accepted. Convenient, but see the disk note below.
+
+### ⚠ `flutter_foreground_task` is on two deprecation paths
+
+Both warnings name the same package — the one chosen for Android background liveness in
+T12:
+
+- **iOS:** does not support Swift Package Manager. *"This will become an error in a future
+  version of Flutter."*
+- **Android:** applies the Kotlin Gradle Plugin. *"Future versions of Flutter will fail to
+  build if your app uses plugins that apply KGP."*
+
+Neither breaks today's build. Both should be re-checked at T12, and they strengthen the
+case for the `LocationSource` seam in T10 — the background layer needs to stay swappable.
+
+### The disk problem was real, just not where the plan predicted
+
+The plan braced for SDK *installs* filling the disk. The actual consumption was **builds**:
+free space fell from 22 GiB to **3.9 GiB** during the first Android build — Gradle caches
+grew 3.7 → 8.0 GB, the NDK added 2.8 GB, and `build/` alone reached 2.7 GB.
+
+Recovery, in order of how safe each step was:
+
+| Action | Reclaimed |
+|---|---|
+| Delete `build/` + `flutter clean` + the native app's `app/build` | ~3.8 GiB |
+| Prune Gradle caches for versions **no project uses** (9.5.0, 9.7.0), `build-cache-1`, and the native project's 8.11.1 distribution | ~3 GiB |
+
+Ended at **11 GiB free (94% used)**. `modules-2` (1.9 GB) was deliberately **kept** —
+deleting it forces a re-download of every dependency, which is a real time cost for space
+we do not currently need. Only two Gradle versions are actually in use: 9.3.1 (this
+project) and 8.11.1 (the native app, whose distribution cache re-downloads on demand).
+
+**Standing risk for T24:** the Android emulator needs a fixed 7.4 GiB free to boot. At 11
+GiB that works, but one more full build cycle could eat the margin. Run `flutter clean`
+before booting the emulator.
+
 ### Dependencies
 
 `flutter_riverpod` · `go_router` · `drift` + `drift_flutter` · `path_provider` ·