The synthetic connection P17 drives directly at acceptConnection() never
reaches CONNECTED (it was never dialed anywhere), so it never joins `peers`
either way — connectionCount alone couldn't tell "refused" apart from
"attached but still handshaking". Manually restoring the disposed-check's
removal and rerunning showed the original assertion passing regardless.
retain() is synchronous and only the attach path calls it, so comparing
CultMeshQuicNativeRuntime.refCount immediately around the acceptConnection()
call is what actually distinguishes the two: confirmed by hand that the
mutation now fails this test by assertion (2 !== 1) before restoring it.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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