vague-quantifier   "some / many / reasonable / appropriate / sufficient / fast enough / low latency"
missing-actor      "the system" sentences without a named actor
unbounded-modal    "may / might / could / should usually" without a hard rule
tbd-leak           TODO / FIXME / placeholder text not caught by Open Questions
dangling-ref       cross-reference whose target doesn't exist
goal-collision     adjacent goals that contradict ("however", "but also")
missing-negative   FR has a happy AC but no negative or permission AC