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>

composeApp/build.gradle.kts

@@ -222,3 +222,12 @@ compose.desktop {
         }
     }
 }
+
+// Roborazzi screenshot-regression plugin (P8). Pin the golden-image
+// output directory inside the test source set so goldens live in git
+// alongside the tests themselves. Anything under build/ is gitignored
+// and gets blown away by `gradle clean` — not where committed goldens
+// belong.
+roborazzi {
+    outputDir.set(layout.projectDirectory.dir("src/androidUnitTest/roborazzi"))
+}