Baseline: wave 1A server complete, wave 1B Android scaffold + design system green

assembleDebug, testDebugUnitTest, and recordPaparazziDebug all pass.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016bThmkmyUUdqQpy3MXFFe5

app/build.gradle.kts

@@ -0,0 +1,20 @@
+// Top-level build file where you can add configuration options common to all sub-projects/modules.
+//
+// AGP 9 has Kotlin support BUILT IN (the org.jetbrains.kotlin.android plugin no
+// longer exists / must not be applied). AGP's built-in Kotlin defaults to bundling
+// its own Kotlin Gradle Plugin version; bump it here to the version we actually
+// want (must match the Compose/serialization plugin versions below).
+buildscript {
+    dependencies {
+        classpath("org.jetbrains.kotlin:kotlin-gradle-plugin:2.3.21")
+        classpath("com.google.devtools.ksp:symbol-processing-gradle-plugin:2.3.11")
+    }
+}
+
+plugins {
+    alias(libs.plugins.android.application) apply false
+    alias(libs.plugins.kotlin.compose) apply false
+    alias(libs.plugins.kotlin.serialization) apply false
+    alias(libs.plugins.ksp) apply false
+    alias(libs.plugins.paparazzi) apply false
+}