Follow-up to the #95007 partial cherry: waitForInitialConnection() was
an unbounded listen on $connection — a primary that never publishes its
descriptor (spawn failure, dead SSH target) would strand
initializeConnectionsRegistry() forever and the last-used source would
never be restored. Bound it with the codebase's withTimeout helper
(same pattern as the sibling SWITCH_* call sites in this file): after
45s (the primary spawn budget) the restore proceeds exactly as it did
before the wait existed, and the listener is torn down either way.
Regression test: boot restore proceeds after the deadline with the
descriptor never arriving.
Original-PR: #95007
Teknium
b2a58dbb39