user b8f7217e43 feat: connection rate and chain latency metrics ...

Add RateTracker (rolling deque, events/sec) and LatencyTracker (circular
buffer, p50/p95/p99 in ms) to the Metrics class.  Both are recorded in
_handle_client and exposed via summary(), to_dict(), /status, and /metrics.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

2026-02-18 00:16:46 +01:00

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