Version history and rollback authority across surfaces; protection levels; touches Commons proposal model.
Why this matters
Every page (Fact graph node, Commons entry, Home work, LoreLine) needs version history, rollback semantics, and protection levels. Touches the Commons proposal model — who can roll back what and under what authority must be explicit.
Page protection in particular is a governance question disguised as a technical one. Wikipedia’s tiered protection levels and the rules surrounding them are an entire subdomain of project policy.