M0: Floret skeleton — Material 3 Expressive scaffold over OpenTasks (planned)

Sibling to Calendula. Pure front-end posture; TaskContract data layer,
task screens and reminder engine to follow (see docs/PLAN.md).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

app/proguard-rules.pro

@@ -0,0 +1,6 @@
+# Keep Hilt-generated classes
+-keep class dagger.hilt.** { *; }
+-keep @dagger.hilt.android.HiltAndroidApp class *
+
+# Compose Compiler may keep its own; defaults are fine
+-dontwarn org.jetbrains.annotations.**