feat(verifier): expose WASM export for did:keri KEL state resolution for web resolvers

[bordumb]

Description

Companion issue to auths-dev/auths-site#32.

To enable web widgets (<auths-verify> and identity resolvers in @auths-dev/verify) to resolve did:keri identities without re-implementing KERI log validation in TypeScript, auths-verifier needs to expose a WASM helper function for resolving active identity public keys from Key Event Logs (KEL).

Proposed Solution

Expose a WASM export function in crates/auths-verifier/src/wasm.rs:

#[wasm_bindgen(js_name = resolveKeriActiveKey)]
pub fn wasm_resolve_keri_active_key(
    kel_json_str: &str,
    sequence: Option<u64>,
) -> Result<String, JsValue>

• Accepts KEL JSON events array and optional sequence number.
• Evaluates icp and rot events via auths-keri / auths-id::domain::keri_resolve.
• Returns active public key hex string or structured error response.

Related Issues

• Companion issue: fix(widget): support did:keri DIDs and P-256 did:key in auto-resolver auths-site#32

Location

• crates/auths-verifier/src/wasm.rs