feat(rust): IdentityAttribute enum + IdentityCheck preset

[chipp]

What

• Add IdentityAttribute enum with variants: DocumentType, DocumentNumber, IssuingCountry, FullName, MinimumAge, Nationality
• Add Preset::IdentityCheck variant for document-based identity attestation (World ID 4.0)
• Add identity_attested: Option<bool> field to IDKitResult for identity-check responses
• Add BridgeResponse::ResponseV2_1 variant to carry identity_attested alongside the proof response
• Wire identity_attributes through BridgeConnectionParams and the bridge request payload
• Add unit tests for BridgeResponse parsing: V2 uniqueness, multi-credential, protocol-level error, and multi-legacy variants

Why

Identity attestation presets require the bridge to assert specific document attributes (age, nationality, document type, etc.) as part of a World ID 4.0 proof request. The identity_attested flag lets callers know whether the World App confirmed those attributes.

Risk

• Low — new enum variants and fields; no changes to existing parsing paths
• BridgeResponse deserialization uses #[serde(untagged)]; new ResponseV2_1 variant sits before ResponseV2 to ensure correct disambiguation

[vercel]

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Project	Deployment	Actions	Updated (UTC)
idkit-js-example	Ready	Preview, Comment	May 1, 2026 5:08pm

[chipp]

• feat(rust): IdentityAttribute enum + IdentityCheck preset  #213 : 3 dependent PRs (#219 , #220 , #221 ) 👈 (View in Graphite)
• ci: add Swift example project compilation to CI pipeline #216 : 1 other dependent PR (#217 )
• fix(ci): add rust-toolchain.toml with locked Rust version, use it across all github workflows #215
• main

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[Takaros999]

i believe there is a failing test for rust/go parity if you can take a look