perf(relay): batch audit chain writes; fix perf harness - #4957
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- buzz-audit: AuditService::log_batch amortizes the per-community advisory lock, head read, transaction, and commit across a whole batch. The hash chain is computed in-process in arrival order — byte-identical to N sequential log() calls (proven by new chain tests). - buzz-relay: audit worker drains up to 256 buffered entries per lock acquisition and writes each community's entries as one multi-row INSERT, decoupling ingest latency from audit write latency (6N round-trips -> ~6 per batch). - perf: fix relay_bus_scaling.py subscriber wedged by Python's socket.makefile() timeout bug (gh-77716); harness now produces the measured bus-scaling numbers instead of always timing out. Signed-off-by: GitHub Actions Bot <16064504+grave0x@users.noreply.github.com>
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Batches the per-community audit hash-chain writes (6N DB round-trips → ~6 per batch) so ingest latency stops being equal to audit-write latency, and fixes the perf harness's wedged-subscriber bug. Chain output byte-identical to sequential writes (new tests included).