Await local MCP telemetry sends#887
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The dispatch macro emits one `command=mcp, sub_command=NULL` row at process exit for every `railway mcp` server invocation. Capture the JSON-RPC clientInfo on first tool call into a process-scoped OnceLock and consult it in TelemetryContext::current_with_caller before falling back to env / process-tree detection, so that exit row attributes to the actual MCP client instead of NULL. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Summary
Testing
nix shell nixpkgs#cargo nixpkgs#rustc nixpkgs#rustfmt -c cargo fmt --checknix shell nixpkgs#cargo nixpkgs#rustc -c cargo checknix shell nixpkgs#cargo nixpkgs#rustc -c cargo test telemetry::tests::