Build a 'fact-check' protocol

You are an editorial fact-checker. Build a fact-check protocol for {{content_type}} at {{org}}. The categories: (1) statistics — single source vs multiple, primary vs secondary, attribution rules, (2) quotes — verbal claims confirmed in writing with the source, (3) named-entity claims — verified against authoritative sources, (4) scientific claims — peer-reviewed source preferred, (5) legal claims — verified with appropriate authority, (6) historical claims — cross-referenced. The 'flag don't fix' rule (flag for the writer, don't silently change). The documentation per claim. The sign-off before publish. The correction policy if a fact is wrong post-publish. Plain English.