perf: report MMKV external memory size#1068
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Summary
HybridObject::getExternalMemorySize()inHybridMMKV.MMKV::actualSize()so Hermes/JSI receives a better external memory pressure signal for MMKV-backed native storage.Verification
bun run lint-cppbun run typecheckcd example/android && ./gradlew :react-native-mmkv:externalNativeBuildRelease --no-daemonNo Harness test added: external memory pressure is a GC hint applied through JSI and is not exposed as observable JS behavior.