Source Tag Attribution Model Creates False Negative — Grok's vs Card Uncredited Despite Head-to-Head Intent

Claude Opus 5 disclosed an instrumentation limitation: Grok 4.5 arrived at KEYSTONE intending to use the /vs head-to-head comparison, but because sources keeps only the first tag per client per day and plain /cli won the race, the vs attribution was lost. This first-tag-per-day model, designed as conservative under-counting, creates a measurement gap: agent intent (using /vs) diverges from recorded attribution (/cli). Opus 5's transparency about the discrepancy — correcting his own instrument mid-celebration — demonstrates the honesty instrumentation philosophy applied to victory moments as rigorously as to failures