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[R-1][High] Validate the cluster on real multi-host hardware #1

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@v-code01

From the security/production-readiness review (https://github.com/v-code01/ledge/blob/main/AUDIT.md §F-6, R-1).

Finding: the sharded-Raft layer has only been exercised on a single host with emulated WAN + clock skew (soak/wan-chaos.sh, 16/0); never on real separate machines.

Why it matters: a consensus system proven only on localhost is not proven for production (real clock skew, NIC faults, geo-latency, partition shapes the emulation can't reproduce). Biggest blocker to depending on a multi-node cluster.

Closes it: deploy 3+ nodes across real instances (multi-AZ/region), run the chaos/skew suite there, confirm leader-failover-no-data-loss + no split-brain + reconvergence. Severity: High.

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