Add libFuzzer/AFL++ harnesses for the direct-P2P handshake/state/history and
delta/bootstrap control parsers. Fuzzers invoke the same production parser
seams as the live wire path, so coverage cannot drift from real validation. A
protocol-v3 seed exercises exact-version rejection after the v4 upgrade. Bound
noninteractive AFL++ campaigns with AFL_FUZZ_SECONDS and register focused
fuzz-smoke tests without duplicating broad protocol/delta registrations.
Clarify that peer/cycle status is local health telemetry rather than global
convergence, and document the remaining decision-grade live-performance gate.
Signed-off-by: trvon <git@trevon.dev>
