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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{
  "histogram/record/1000":    { "median_s": 0.000031227,  "tolerance": 0.35 },
  "histogram/record/10000":   { "median_s": 0.00024574,   "tolerance": 0.35 },
  "histogram/record/100000":  { "median_s": 0.0020168,    "tolerance": 0.35 },

  "histogram/percentiles/10000":   { "median_s": 0.000004637,  "tolerance": 0.35 },
  "histogram/percentiles/100000":  { "median_s": 0.0000037215, "tolerance": 0.35 },
  "histogram/percentiles/1000000": { "median_s": 0.0000068704, "tolerance": 0.35 }
}