qa-cost
AI API cost tracking and budget gate. Reads token usage metadata from CTRF output files produced by qa-* skills, computes estimated cost per skill using current Claude model pricing, and can block CI if the total run cost exceeds a configured budget. Provides financial observability alongside functional QA observability. Env vars: QA_COST_BUDGET, QA_COST_MODEL. (qa-agentic-team)