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Bisecting (base was 4/4 clean, branch 3/3 hung, reliably reproducible) pinned the parallel-suite exit hang to the public-message signature requirement (security fix #2), via FragmentationTests: reassemblyFromFragmentsDeliversPublicMessage and duplicateFragmentDoesNotBreakReassembly send fragments of an UNSIGNED public message and `await capture.waitForPublicMessages(...)`. With #2 the reassembled unsigned message is now (correctly) dropped, so didReceivePublicMessage never fires. The helper then trips a latent bug: on timeout it cancels the waiter task but never resumes its CheckedContinuation, so the throwing task group's teardown awaits a child that never completes and the whole test process hangs at exit (SIGKILL'd by CI). Base never hit it because the message always arrived in time. Fix matches the security model — real public broadcasts are signed: sign the reassembled packet with a NoiseEncryptionService and preseed the sender's signing key (same pattern as duplicatePacket_isDeduped), so #2 verifies and delivers it. Full parallel suite now exits cleanly 5/5 locally (branch was 3/3 hung before). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>