Make SPIFFE ID format recommended, not required for iss claim
Allow any URI scheme for the iss claim (SPIFFE, HTTPS, URN:UUID) to support non-WIMSE deployments that want DAG tracing without SPIFFE infrastructure. SPIFFE format remains SHOULD for WIMSE deployments. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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