Create package-info.java files for concilium-core, concilium-orchestration,
concilium-integrations, and concilium-memory modules. Add CoreSmokeTest
that validates QQQ QInstance is on the classpath and functional.
Fix JUnit platform launcher version mismatch caused by the QQQ BOM
constraining junit-jupiter to 6.0.2 while Gradle's internal launcher
was older. Added junit-platform-launcher 6.0.2 as testRuntimeOnly.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>