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muster release v0.4.1

Jun 12, 2026 AI Agents muster v0.4.1

Changed

Update mcp-oauth to v0.3.1: forwarded ID tokens (trustedAudiences) are no longer hard-rejected by the trusted-issuer Bearer branch when the same issuer is also configured in trustedIssuers — fixes Backstage AI-chat SSO token forwarding returning 401 (typ header is "", expected "at+jwt") on deployments with the token-exchange broker enabled. (#838)