chore(instrumentation): record Node.js version in MCP telemetry

[SavioBS629]

What

Add node_version (process.versions.node) to the MCPInstrumentation telemetry event.

Why

We're about to raise the supported Node floor (the sharp bump requires Node ≥ 20.9). Before we do, we need to know how many users are on old Node versions so we can gauge the blast radius and roll out safely. This captures the Node version the server actually runs on, on every instrumentation event.

Change

One field added to the event payload (interface + value). No behavior change, no new dependency.

Testing

npm run lint, tsc --noEmit, and the full test suite pass.

🤖 Generated with Claude Code

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