docs: add AI skill usage governance

cai

2026-06-07 512faa36f7634c3e25068761afaf3f20d2e8170f

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artifact,path,sha256
raw_input,exp-data/raw/RUN-20260601-PROJA-SIGNAL-CROSS-001/signal_cross_input.csv,f94a2921e2169b71d70510f1c5c70fa2521ffee0d4971f5ff08c829ee350bf3a