Follow the sibling project's rename to dev-updater

It is no longer "local" -- it serves over WireGuard rather than the LAN --
and it is specifically for developing new apps. Renaming the references
here at the same time keeps one name to search for across both repos.

Also drops the last references to gen-dev-cert.sh, which the in-process
certificate generation replaced: the build script and the Gradle task now
say to start the server once, and test-wg-tunnel.sh reads the
certificates from the XDG directory rather than the repo.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017xn8nHw1tw1R6PtiY1eEtw

app/androidApp/src/main/kotlin/com/example/aiapp/MainActivity.kt

@@ -36,7 +36,7 @@ class MainActivity : ComponentActivity() {
 
         // Transparent status bar on every version; the Surface below paints
         // through underneath it and content insets itself. Same reasoning
-        // as local-updater's MainActivity.
+        // as dev-updater's MainActivity.
         enableEdgeToEdge()
         WindowCompat.getInsetsController(window, window.decorView).isAppearanceLightStatusBars = true
 

app/androidApp/src/main/kotlin/com/example/aiapp/SessionListScreen.kt

@@ -36,7 +36,7 @@ import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
 
 // Status colors, keyed by the wire strings in Events.kt. Light theme only,
-// as in local-updater.
+// as in dev-updater.
 private val AWAITING_COLOR = Color(0xFFB26A00)
 private val RUNNING_COLOR = Color(0xFF2E7D32)