Initial commit: HeliBoard + Gemma 4 on-device AI correction

Integrates LiteRT-LM (Google) with Gemma 4 E2B-it for on-device
spell/grammar correction in HeliBoard. After sentence-ending punctuation,
the model checks the sentence and shows a correction in the suggestion strip.
Tapping it replaces the original text — fully offline, no cloud API.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

build.gradle.kts

@@ -0,0 +1,6 @@
+plugins {
+    id("com.android.application") version "9.0.1" apply false
+    id("org.jetbrains.kotlin.android") version "2.2.10" apply false
+    id("org.jetbrains.kotlin.plugin.serialization") version "2.0.21" apply false
+    id("org.jetbrains.kotlin.plugin.compose") version "2.2.10" apply false
+}