feat: per-session metrics + inter-relay health probe (T5-S2/S5)
WZP-P2-T5-S2: Per-session Prometheus metrics
- 5 new per-session gauges/counters: buffer_depth, loss_pct, rtt_ms,
underruns, overruns — all labeled by session_id
- update_session_quality() reads QualityReport from packet headers
- update_session_buffer() tracks jitter buffer state per session
- remove_session_metrics() cleans up labels on disconnect
- Delta-aware counter increments avoid double-counting
- 2 tests: session_quality_update, session_metrics_cleanup
WZP-P2-T5-S5: Inter-relay health probe
- New probe.rs: ProbeConfig, ProbeMetrics, SlidingWindow, ProbeRunner
- --probe <addr> flag (repeatable) spawns background probe per target
- Sends Ping/s over QUIC, receives Pong, computes RTT/loss/jitter
- SlidingWindow(60): tracks last 60 pings, loss = missed pongs,
jitter = std deviation of RTT
- Prometheus gauges: wzp_probe_rtt_ms, loss_pct, jitter_ms, up
with target label
- Probe connections use SNI "_probe" — relay responds with Pong loop,
skipping auth/handshake
- Auto-reconnect with 5s backoff on disconnect
- 6 tests: metrics_register, rtt/loss/jitter calculation,
window eviction, empty edge cases
231 tests passing across all crates.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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