AGP 9's consistent resolution shares the runtime serialization version with the
androidTest classpath, where androidx.savedstate pins it to 1.7.3. Room 2.8's
schema-bundle serializers are compiled against >= 1.8.0, so MigrationTestHelper
threw AbstractMethodError on GeneratedSerializer.typeParametersSerializers(),
failing every E2E job. Import the serialization BOM as a platform to force 1.8.1.
Verified on-device (API 37): Migration9To10Test fails unpatched, passes patched.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
JMR-devandClaude Opus 4.8
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