fix: freeze registries and restore failed root state

[chaokunyang]

Summary

• freeze each runtime registry when its first root serialization or deserialization starts, including failed roots
• keep native lazy type discovery and serializer or metadata completion available after the explicit registration boundary closes
• preserve thread-safe facade ownership and Kotlin/Scala BaseFory support without duplicate lifecycle state
• release root-owned read and write scratch state after failures without changing wire behavior

Validation

• focused and full runtime test suites pass across the affected languages
• formatting, lint, cross-language integration, and native/JDK-specific builds pass
• sequential latest-main A/B validation found no implementation-path performance regression