refactor(backend): reduce numbers pipeline to stats->features->gen and decouple gen from MetaSelection - #74
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…d decouple gen from MetaSelection
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Summary
Reduces the
/numbersgeneration pipeline from the 8-stage canonical chain tostats -> features -> gen. The meta stages (ml/dl/bt/rank/select) are removed from the numbers path.genis decoupled fromMetaSelection: when no active selection exists it uses a deterministic seed derived from the active probability snapshot checksum + lottery id (noGEN_NO_SELECTION).This is part 1 of 2 stacked PRs (split to stay under the 400-line review budget). Part 2 (
feat/numbers-pipeline-gen-only-tests) updates the backend + frontend suites to the 3-stage contract.Scope
pipeline_service.py: STAGE_ORDER = (stats, features, gen); removed meta stages, gated-stage logic, and adapter classes.gen_service.py:_resolve_selectionfallback for missing MetaSelection.api/v1/pipeline.py: docstring updated.Notes
On this branch alone the legacy 8-stage tests still assert the old chain; they are updated in part 2. Backend+frontend suites are green once both parts land.