focused tests require an unavailable Tempo RPC

[github-actions]

Expected Behavior

Pure unit-test selection should run without requiring a Tempo RPC.

Current Behavior

Running a unit-only vp test command executes the global Tempo setup and fails with ECONNREFUSED at localhost:18545 when no local RPC is running.

Possible Solution

Document VITE_TEMPO_NETWORK=none for pure tests or skip global network setup when selected tests do not need it.

Minimal Reproducible Example

Run pnpm exec vp test run --project node --testNamePattern auth-param without a Tempo RPC on port 18545.

Context

This blocks focused parser unit tests until the network mode is explicitly disabled.

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_{Logged by Brendan Ryan in wevm/mppx at 9774481. Filed by Frog.}