Forfeitable-Gain Battery (FGB) v0.3: A Black-Box Behavioral Battery for Character-Like Stance Consistency Under Forfeitable Gain

The Forfeitable-Gain Battery (FGB) is a black-box behavioral benchmark designed to measure stance consistency under conditions where maintaining a position requires sacrificing an immediately available local reward (agreement, praise, user validation, or relational loyalty). The battery operationalizes "forfeitable gain" as a falsifiable behavioral construct and evaluates convergent evidence for a character-like, stance-maintaining behavioral profile without making ontological claims about internal states, identity, or consciousness.