Allow the preceding Ghidra ownership preparation before waiting for the gated Kuna child. Keep the two-second cancellation join, exact reasons, reaping and cleanup assertions unchanged.
Refs #5568. A controlled startup delay reproduces the old failure; disabling cancellation forwarding still fails the retained join assertion. All 86 focused setup, doctor, helper and CLI checks passed on pinned Node 24.18.0/macOS arm64.