layer: RTT-aware RS pollChunks peer order (LatencyTier)#45
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PeerSessionStats gains rtt_ms (default unknown). RsStrategy.pollChunks sorts peers by LatencyTier then lower RTT before allocate. Extract tier thresholds and latencyTier into layer/latency_tier.zig; discovery/peering/score re-exports for existing API. Closes #39
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Summary
PeerSessionStats.rtt_ms— optional signal for dispatch (defaultmaxInt(u32)= unknown / lowest preference).RsStrategy.pollChunks— collects active peers, sorts bylatency_tier(inner → mid → outer) then lower RTT, then runsallocatein that order.layer/latency_tier.zig— single source forrtt_inner_ms/rtt_mid_ms,LatencyTier, andlatencyTier();discovery/peering/scorere-exports the same names so callers stay unchanged.pollChunks prefers inner-tier peer by RTTtest inrs_strategy.zig; tier boundary tests live inlatency_tier.zig(removed duplicate fromscore.zig).Closes #39