P8: Roborazzi golden image pipeline live

Records initial golden set + wires verifyRoborazziDebug into CI. Diffs
uploaded as artifact on failure. ScreenshotTests @Ignore removed.

Root cause of the prior RoboMonitoringInstrumentation:102 failure:
createComposeRule() launches ActivityScenarioRule<ComponentActivity>
which fires a MAIN/LAUNCHER intent, but the merged unit-test manifest
declares androidx.activity.ComponentActivity without a LAUNCHER filter,
so Robolectric's PM returns "Unable to resolve activity for Intent".
Fix: switch to the standalone captureRoboImage(path) { composable }
helper from roborazzi-compose, which registers
RoborazziTransparentActivity with Robolectric's shadow PackageManager
at runtime and bypasses ActivityScenario entirely.

Also pin roborazzi outputDir to src/androidUnitTest/roborazzi so
goldens live in git (not build/) and survive gradle clean.

36 goldens, 540KB total.

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

.github/workflows/android-ui-tests.yml

@@ -18,6 +18,14 @@ jobs:
         run: ./scripts/verify_test_tag_parity.sh
       - name: Run unit tests
         run: ./gradlew :composeApp:testDebugUnitTest
+      - name: Verify screenshot regressions
+        run: ./gradlew :composeApp:verifyRoborazziDebug
+      - name: Upload screenshot diffs on failure
+        if: failure()
+        uses: actions/upload-artifact@v4
+        with:
+          name: roborazzi-diffs
+          path: composeApp/build/outputs/roborazzi/
       - name: Run instrumented tests (managed device)
         run: ./gradlew :composeApp:pixel7Api34DebugAndroidTest
         env: