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mavend's hand-rolled Nexus and Praxis HTTP clients sent bare requests with no version or correlation headers, unlike the Hexis client. Added a shared context-based correlation ID mechanism and version headers (X-Nexus-Version, X-Praxis-Version) across all Nexus/Praxis call sites, and threaded the correlation ID already generated in executeCapability through to the Nexus/Praxis calls in the same request chain. Synced vendor/ copy of hexis/pkg/client after its WithCorrelationID addition. Part of Vikunja #273. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018ghELqYhZNLub2TXGMazqA