The anchors-a-relative-add-spec case serializes two subprocesses (plugin
add + remove) under a hardcoded 90s budget, which the 2x60s worst case
exhausts; derive it from SPAWN_TIMEOUT_MS * 2 + 30s like the other
dual-call cases. The pnpm setup isolation note now also records the python
SDK exe build's suffixed destination and its regression-test coverage.