Introduce SpanPrototype: baked-once constant span-tag descriptor#11828

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dougqh/span-prototype

Commits on Jul 1, 2026

Introduce SpanPrototype + BaseDecorator bake (increment 1: abstraction only)

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claude
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Reshape SpanPrototype to a builder API (extends_ / init*, no TagMap exposed)

dougqh
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claude
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Add SpanPrototypeBenchmark: per-mechanism constant-application benchmark

dougqh
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