docs(plan): adapt foundation plan to actual dev toolchain

Dev machine has no host gradle binary; bootstrap from HouseHoldKeaper's
wrapper (Gradle 8.14, compatible with AGP 8.7.2). Default JDK is 26,
but AGP 8.7.2 needs JDK 17-21; require JAVA_HOME=jdk-17 on local
invocations. CI is unaffected (setup-java pins 17).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

docs/superpowers/plans/2026-06-08-01-foundation.md

@@ -7,7 +7,7 @@
 **Architecture:** Single Gradle module `:app`, Kotlin 2.1 + Jetpack Compose mit Material 3 Expressive (1.5+), Hilt für DI, DataStore-Preferences für App-Settings. Build via Gradle Kotlin DSL und Version Catalog (`libs.versions.toml`). CI über Gitea Workflows (adaptiert von HouseHoldKeaper, Flutter-Steps durch Gradle-Steps ersetzt). Alle Resourcen + Strings i18n-fähig ab Tag 1 (DE + EN).
 
 **Tech Stack:**
-- Kotlin 2.1.0, Gradle 8.11.1, AGP 8.7.2, JVM Target 17
+- Kotlin 2.1.0, Gradle 8.14 (bootstrapped from HouseHoldKeaper's wrapper), AGP 8.7.2, JVM Target 17
 - minSdk 29, targetSdk 36, compileSdk 36
 - Jetpack Compose BOM 2025.05.00, Material3 1.5.0 (Expressive APIs)
 - Hilt 2.53 + KSP 2.1.0-1.0.29
@@ -140,12 +140,9 @@ local, WebCal subscriptions, ...) is shown.
 
 ## Building
 
-Requires Android SDK 36 and JDK 17.
+Requires Android SDK 36 and JDK 17. The Gradle wrapper is checked in, so no host Gradle install is needed:
 
 ```bash
-# Bootstrap the gradle wrapper (one-time, requires a host gradle install)
-gradle wrapper --gradle-version 8.11.1 --distribution-type bin
-
 # Build debug APK
 ./gradlew assembleDebug
 
@@ -156,6 +153,12 @@ gradle wrapper --gradle-version 8.11.1 --distribution-type bin
 ./gradlew lint
 ```
 
+If your default JDK is something other than 17, set `JAVA_HOME` explicitly:
+
+```bash
+JAVA_HOME=/path/to/jdk-17 ./gradlew assembleDebug
+```
+
 ## License
 
 [MIT](LICENSE) — Jean-Luc Makiola, 2026
@@ -675,35 +678,35 @@ kotlin.incremental=true
 android.uniquePackageNames=true
 ```
 
-- [ ] **Step 5: Bootstrap the Gradle wrapper**
+- [ ] **Step 5: Bootstrap the Gradle wrapper from sibling project**
 
-This requires a host `gradle` installation. Run once:
+The dev machine has no host `gradle` installed, but `HouseHoldKeaper/android/` already has a working wrapper (Gradle 8.14). Bootstrap from there:
-
-```bash
-gradle wrapper --gradle-version 8.11.1 --distribution-type bin
-```
-
-Expected: creates `gradle/wrapper/gradle-wrapper.jar`, `gradle/wrapper/gradle-wrapper.properties`, `gradlew`, `gradlew.bat`.
-
-Then make `gradlew` executable:
 
 ```bash
+mkdir -p gradle/wrapper
+cp /home/jlmak/Projects/jlmak/HouseHoldKeaper/android/gradlew .
+cp /home/jlmak/Projects/jlmak/HouseHoldKeaper/android/gradlew.bat .
+cp /home/jlmak/Projects/jlmak/HouseHoldKeaper/android/gradle/wrapper/gradle-wrapper.jar gradle/wrapper/
+cp /home/jlmak/Projects/jlmak/HouseHoldKeaper/android/gradle/wrapper/gradle-wrapper.properties gradle/wrapper/
 chmod +x gradlew
 ```
 
-- [ ] **Step 6: Verify gradle wrapper works**
+Gradle 8.14 is compatible with AGP 8.7.2 (Gradle is backward-compatible for AGP versions; newer Gradle works fine).
+
+- [ ] **Step 6: Verify gradle wrapper works (with JDK 17)**
+
+The system default JDK is 26, but AGP 8.7.2's compatibility envelope is JDK 17–21. Use JDK 17 explicitly for every gradle invocation in this plan:
 
 ```bash
-./gradlew --version
+JAVA_HOME=/usr/lib/jvm/java-17-openjdk ./gradlew --version
 ```
 
 Expected output includes:
 ```
-Gradle 8.11.1
+Gradle 8.14
-Kotlin: 2.0.x
 ```
 
-(Don't worry about the specific Kotlin version in the gradle output — that's gradle's bundled Kotlin, separate from our project Kotlin 2.1.0.)
+> Going forward in this plan, every `./gradlew ...` invocation must be prefixed with `JAVA_HOME=/usr/lib/jvm/java-17-openjdk` on this dev machine. CI sets `setup-java@v4 java-version: 17` so no prefix is needed there.
 
 - [ ] **Step 7: Commit**