docs: update shared governance guidance

Cai

2026-08-02 2e75602f50514a2d90b77099bc079189a849b3b0

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