Remove historical and implementation commentary from Lua wiki
docs: point 0.8.0 wiki links to main
docs: audit 0.8.0 wiki accuracy
docs: explain finite fluids and animated appearances
docs: clarify lesson namespace scope for fluids
docs: link fluid lesson and refresh example order
docs: document fluid entity and camera policies
docs: clarify fluid bucket safety
docs: explain identity-aware vanilla hardening
docs: document custom fluid API