- Assert FastSync's sparse/preallocate block accounting matches rsync 3.4.1
for a hole file (preallocate wins over sparse, exactly like rsync).
- Assert --ignore-existing is answered by the receiver before the sender
transmits the payload (CountingProxy wire volume near-zero).
- CountingProxy.run gains a bounded join_timeout so tests that only need the
client->server count do not wait for the server's idle socket.
- Fix the stale protocol 2.24.0 comment in test_config.c (golden is 2.26.0).
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