chore: batch fix final-review findings on Plan 01

- ROADMAP: mark v0.1 (Foundation & CI) as complete
- REQUIREMENTS: move Foundation & CI from Active to Validated (shipped)
- AndroidManifest: drop redundant android:label and android:theme on
  MainActivity - both inherited from <application>
- build.gradle.kts: move ui-tooling-preview to debugImplementation
  (@Preview annotations are dev-only; release APK stays smaller)

All foundation verification (lint + test + assembleDebug) still green.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

app/build.gradle.kts

@@ -92,7 +92,7 @@ dependencies {
     implementation(platform(libs.androidx.compose.bom))
     implementation(libs.androidx.ui)
     implementation(libs.androidx.ui.graphics)
-    implementation(libs.androidx.ui.tooling.preview)
+    debugImplementation(libs.androidx.ui.tooling.preview)
     implementation(libs.androidx.material3)
 
     implementation(libs.hilt.android)