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/.gitignore

@@ -0,0 +1,12 @@
+*.iml
+.gradle/
+/local.properties
+.idea/
+.DS_Store
+/build
+/captures
+.externalNativeBuild
+.cxx
+local.properties
+**/build/
+.kotlin/