Sprint 1 complete: hybrid Compose + LibGDX architecture building

Full AL-001 through AL-008 implementation: shared/ module with ModuleType
enum, GameHost routing, StylusInputBridge, LineCorridorScreen with live
stroke rendering, LineScore (straightness + anglePrecision), score returned
to Compose hub via ActivityResult. Fixes LineScore field mismatch
(pressureConsistency → anglePrecision) caught during AL-009 build check.
Adds .gitignore and handoff notes.

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

shared/build.gradle.kts

@@ -0,0 +1,7 @@
+plugins {
+    kotlin("jvm")
+}
+
+kotlin {
+    jvmToolchain(17)
+}

shared/src/main/kotlin/com/artlegend/shared/ModuleType.kt

@@ -0,0 +1,8 @@
+package com.artlegend.shared
+
+enum class ModuleType {
+    LINE_CORRIDOR,
+    PRESSURE_RAMP,
+    CURVE_SCULPTOR,
+    VECTOR_SNAP
+}