benchmark 0.8.0

Nanosecond-precision benchmarking for dev, testing, and production. Zero-overhead core timing when disabled; optional std-powered collectors and zero-dependency metrics (Watch/Timer) for real service observability.
Documentation 
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{
  "watch/record_instant/n=1000": { "median_s": 0.000103, "tolerance": 0.20 },
  "watch/record_instant/n=10000": { "median_s": 0.000970, "tolerance": 0.20 },
  "watch/record_instant/n=100000": { "median_s": 0.0105, "tolerance": 0.25 },

  "watch/snapshot_scaling/m=1 s=10000": { "median_s": 0.00000148, "tolerance": 0.30 },
  "watch/snapshot_scaling/m=10 s=10000": { "median_s": 0.0000120, "tolerance": 0.30 },
  "watch/snapshot_scaling/m=100 s=5000": { "median_s": 0.000097, "tolerance": 0.35 },

  "timer/drop_throughput/n=1000": { "median_s": 0.000218, "tolerance": 0.25 },
  "timer/drop_throughput/n=10000": { "median_s": 0.002116, "tolerance": 0.20 },
  "timer/drop_throughput/n=100000": { "median_s": 0.0230, "tolerance": 0.20 }
}