[wip] feat(observability/metrics): add Emitter, options, buckets, and shared utils#157
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Ports the Tango Metrics Inventory RFC into the repo. Covers the Emitter contract, buckets, TrackInFlight, RecordFailure, context propagation, shared constants, and OSS / internal / CLI usage.
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…d names Emitter is an interface; the default implementation wraps tally.Scope with op-as-subscope semantics, base tags via Tagged, default histogram buckets, and TrackInFlight. New(nil) is safe (NoopScope).
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Introduces the
observability/metricspackage skeleton — a thin flavoured wrapper over tally.Scope with op-as-subscope semantics, per-emitter base tags via Tagged, and default histogram buckets.nil-scope is safe.No consumers migrate in this PR; adoption comes later.
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