feat: add stddev/variance aggregation ops with Welford's online algorithm

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- New aggregation ops: stddev and variance (incremental, O(1) per update)
- Welford's online algorithm for numerically stable running variance
- MetricState extended with m2 field for variance tracking
- AggregationProvider interface: defineAggregate, removeAggregate, restoreState, serializeState
- Export AggregateGroupState and MetricState types
- Plugin docs: aggregation provider, analytics providers (HyperLogLog, t-digest, etc.)
- Aggregation architecture and usage guide docs

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

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David Snelling 2026-02-17 17:04:11 -08:00

parent 4602960e86

commit b7c6752388

9 changed files with 1435 additions and 792 deletions

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tests/comprehensive/public-api-complete.test.ts

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