Bindings React Native: qualify a UniFFI-compatible TurboModule adapter

Parent: #163. Research decision: #215. ADR: `docs/adr/0097-use-proc-macro-uniffi-for-the-first-native-did-slice.md`.

## Question

Can a maintained `uniffi-bindgen-react-native` release consume the SDK's selected UniFFI line and provide a production-worthy React Native New Architecture/TurboModule adapter without coupling generic crates to JSI or mobile build systems?

## Current stop condition

The assessed `uniffi-bindgen-react-native 0.31.0-5` source at `0f7fc67e8dd98ad43af3787d45c3c570d469a145` is MPL-2.0 and pins UniFFI 0.31. The SDK native direction selected in #215 uses UniFFI 0.32. Do not mix these generator/runtime contracts or depend on an unreleased branch.

## Scope

- Reassess only after an exact released UniFFI 0.32-compatible candidate exists.
- Pin npm/Cargo artifacts, source revisions, licenses, Node/Yarn/React Native versions and dependency cones.
- Keep Rust domain and native binding crates free of JSI/TurboModule types.
- Spike the bounded DID/DID URL surface on iOS and Android New Architecture runtimes.
- Test Metro/codegen, async/runtime/thread behavior, exceptions, memory ownership, generated API drift and package reproducibility.

## Acceptance

A research OpenSpec/ADR records go/no-go, exact iOS/Android runtime evidence, security/native/unsafe and maintenance posture, rollback and reconsideration triggers. No support claim, production dependency, downstream edit, publication or release occurs in the research issue.

Start with docs/adr/0097-use-proc-macro-uniffi-for-the-first-native-did-slice.md and research decision #215, then verify that an exact released UniFFI 0.32-compatible candidate exists; do not mix it with the assessed 0.31.0-5 source. Spike the bounded DID/DID URL surface on iOS and Android New Architecture runtimes, testing the listed runtime, ownership, exception, drift and reproducibility concerns. Done means an OpenSpec/ADR records go/no-go, exact runtime evidence, maintenance and security posture, rollback and reconsideration triggers.

Written by the indexing model from the issue text.