Rust quickstart (backend and CLI)

[truthixify]

Tier: M (2-4 days) | Type: tutorial

Context. All existing quickstarts assume TypeScript. The Stellar contracts are Rust and there is a natural pull for Rust-native backends (indexers, relayers, CLIs) that talk to the contracts directly via stellar-xdr and soroban-client. No first-class quickstart exists.

Scope.

• New guides/quickstarts/rust.mdx.
• Cargo setup: dependencies + feature flags for testnet vs mainnet.
• Load a keypair, derive stealth keys (call the Wraith crate or reimplement per spec).
• Fetch and scan announcements.
• Send a stealth payment.
• Callout on where the Rust-side story is thinner than TS and what is planned.

Acceptance.

• Example compiles and runs against futurenet
• Rust fences marked no-check so TS snippet gate is not broken
• Renders in mint dev
• Nav entry under Guides
• Cross-linked from sdk/overview.mdx

Files. guides/quickstarts/rust.mdx (new), sdk/overview.mdx, docs.json.