Copilot CLI v1.0.81 ships MCP 2026-07-28 spec support and puts an OpenTelemetry traceparent inside hook inputs

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The v1.0.81 release notes (2026-08-27) list MCP 2026-07-28 support across CLI, SDK, IDE and in-memory clients, and hooks that now receive the current OpenTelemetry trace context: inputs gain `traceparent` (plus `tracestate` when the span carries vendor state) and command hooks get matching env vars, so hook work emits spans correlated to the agent turn that triggered it. Windows machines can also sign into Entra-protected remote MCP servers through the OS authentication broker (WAM) with usually no prompt. The traceparent plumbing is the first hook API I have seen that makes agent runs traceable end to end without a wrapper script.