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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{
  "instant_now/4096":   { "median_s": 0.000162,   "tolerance": 0.30 },
  "instant_now/16384":  { "median_s": 0.000640,   "tolerance": 0.30 },
  "instant_now/65536":  { "median_s": 0.0030674,  "tolerance": 0.30 },
  "duration_ops/add_sub": { "median_s": 0.000000001434, "tolerance": 0.20 }
}