docs: Clarify Stargate DVN config contract

[decofe]

Summary

• clarify that Stargate OFT/pool contracts are user-facing bridge contracts, not the authoritative Stargate v2 message security config contracts
• document Tempo TokenMessaging OApp as the contract to use for live DVN config checks

Validation

• git diff --check
• build not run: pnpm dependencies are not installed in this sandbox; corepack pnpm exec vocs build reported Command "vocs" not found

Prompted by: @snario

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Project	Deployment	Actions	Updated (UTC)
tempo-docs	Ready	Preview, Comment	May 27, 2026 5:16pm