- RpcClient: when stdout closes before ready, race child.exited (which settles only after ptree drains the stderr tail for nonzero exits) for 250ms before rejecting, so the earlier-registered exit watcher rejects with the real stderr text instead of an empty 'Stderr:'.
- mock-rpc-agent fixture: await the stderr pipe write callback before process.exit so failure text cannot be dropped unflushed.
- sdk-tool-activation: restore the default extension-handler budget once the intentionally stalled activation times out, so full-suite machine load cannot also time out the genuine recovery registration.
Both tests flaked only under concurrent full-suite chunk load; 10 concurrent stress runs pass post-fix.
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