com.publicdomainrelay.temp.requester.associateConfirm

Confirm requester association via PDS service-proxied XRPC call. The webapp calls this through the user's PDS with atproto-proxy header set to the requester's DID with #requester_associate service. The requester verifies the inter-service auth JWT, resolves the caller's handle, and presents a CLI confirmation prompt before proceeding with the RFP flow.