wc-fitness-eval — risk-adjusted, rank-relative fitness

Implements footballfantasy/context/frameworks/fitness-function.md. The whole evolution engine selects on this number, so it must encode the two things that make fantasy fitness not raw points: rank is relative (ownership matters) and the rank objective sets the variance target (the selection-pressure dial).

The formula

fitness(c | θ) =   raw_xEV(c)                    # Σ player xEV (fixture-scaled) + captaincy uplift
                 + cs_corr_bonus(c)              # within-team clean-sheet correlation (BB2 stacks)
                 + progression_carry(c, horizon) # discounted future-round value of deep-team players
                 + ownership_leverage(c | θ)     # rank term — sign/shape set by θ
                 − variance_term(c | θ)          # selection pressure — sign flips with θ
                 − feasibility_penalty(c)        # 0 after clean repair; disqualifying if infeasible

Workflow