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feat(mlb): provenance sidecars for new outputs - #7
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write_provenance() records git commit and dirty files, R and package versions, platform, command, named env vars and sha256 of inputs and outputs next to each output; check_provenance() refuses a cached artifact built under a different recipe. Frozen scripts are untouched; new experiments call it. Rscript research/r/mlb/provenance.R runs a self-check.
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research/r/mlb/provenance.R, the recipe record the 2026-10 review's reproducibility contract asks for (item 3).write_provenance()writes<output>.provenance.json: git commit and dirty files, R and package versions, platform, command, named env vars, sha256 of inputs and outputs.check_provenance()stops when a named env var or input hash differs from the run that built the output.Frozen scripts are not touched:
matchup_build.R,matchup_model.Rand the forward scorer stay as scored, and they are in the review's hash snapshot. New experiments source this file.Verified:
Rscript research/r/mlb/provenance.Rself-check passes (round trip, env change caught, input change caught). CI runs Python and dbt parse only; this file adds no dependency beyond jsonlite and openssl, both already used.