Every feature works on its own. Together, they break.
~3/4 of the top models' failed builds pass every single-feature check. They break where features meet:
▪️ Code hosting: a draft PR never shows its merge conflict.
▪️ Document editor: nobody can comment on a word inside a table cell.
▪️ Design tool: undo can erase a teammate's change, not just yours.
▪️ Chat: a server owner with no roles can't moderate anyone.
