v2.1.42

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Changelog

• Added mcp.clientConfigs[].perUserHeaderKeys — the header names each caller must individually supply under authType: per_user_headers (e.g. ["Authorization"]).
• Added bifrost.plugins.otel.config.overhead_breakdown_enabled (default false) and bifrost.plugins.telemetry.config.overhead_breakdown_enabled - exports the per-component overhead histogram bifrost_overhead_component_microseconds, overhead latency split by the overhead_component label.
• Fixed bifrost.plugins.otel.config.export_overhead_spans not rendering into config.json.