release: cut 0.3.1 — fix the launch crash in minified builds

R8 kept androidx.work.impl.WorkDatabase_Impl but pruned its no-arg
constructor: nothing calls it directly, Room only reaches it reflectively.
Room then threw InstantiationException, surfacing as "Failed to create an
instance of androidx.work.impl.WorkDatabase". WorkManager builds that
database from a startup ContentProvider, so 0.3.0 died before any of our
code ran — every install, every launch.

We don't depend on WorkManager directly; it arrives via Glance. AGP 9's
stricter R8 is what tipped this over, which is why 0.3.0 was the first
release to hit it.

Keep the Room no-arg constructor, and the ListenableWorker constructor
alongside it — same pruning hazard on the path WorkManager uses to
instantiate workers by name, which would have bitten once a Glance widget
update actually ran.

Reproduced the reporter's stack trace frame-for-frame on a releaseTest
build, then confirmed it launches clean afterwards. Fixes #1.

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

app/proguard-rules.pro

@@ -2,5 +2,20 @@
 -keep class dagger.hilt.** { *; }
 -keep @dagger.hilt.android.HiltAndroidApp class *
 
+# Room instantiates its generated <Database>_Impl reflectively through a no-arg
+# constructor. R8 under AGP 9 keeps the class but prunes that constructor, since
+# nothing calls it directly — Room then throws InstantiationException, reported
+# as "Failed to create an instance of ...". We pull Room in transitively via
+# Glance -> WorkManager, whose WorkDatabase is built by WorkManagerInitializer
+# at startup, so the app died on launch in every minified build (issue #1).
+-keep class * extends androidx.room.RoomDatabase { <init>(); }
+
+# WorkManager likewise looks its workers up by name and calls this constructor
+# reflectively — same pruning, but it only bites once a worker actually runs
+# (Glance's widget updates), so keep it explicitly rather than wait for it.
+-keep class * extends androidx.work.ListenableWorker {
+    <init>(android.content.Context, androidx.work.WorkerParameters);
+}
+
 # Compose Compiler may keep its own; defaults are fine
 -dontwarn org.jetbrains.annotations.**