chore: release 1.12.0

[JimmyDaddy]

Summary

• bump react-native-image-marker to 1.12.0
• add generated changelog entries for the server trace runtime, Worker detection, and Playground workflows

Validation

• npm run check:release-notes
• npm run typecheck
• npm run typecheck:example
• npm run typecheck:expo-example
• npm run lint
• npm test -- --runInBand (116 tests)
• npm run prepack
• npm pack --ignore-scripts --dry-run (241 files)
• npm audit --omit=dev --audit-level=moderate (0 vulnerabilities)
• git diff --check