Asset-class definition

A symbol is crypto iff it is in the curated crypto registry or matches the standard BASE-USD crypto quote form (uppercase base of 2–5 letters, -USD/-USDT suffix). That classification selects which set of constants the same engine runs with — the equity profile or the crypto profile (IV.4). Each profile carries its own version + hash, stamped into every result, so equity and crypto provenance never collide.