Separate batting and pitching into distinct tables with descriptive column
names. Eliminates naming collisions (so/k ambiguity) and column mismatches
between the ORM model and raw SQL. Each table now covers all aggregatable
fields from its source (BattingStat/PitchingStat) including sac, ibb, gidp,
earned_runs, runs_allowed, wild_pitches, balks, and games_started.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Evolution models (EvolutionTrack, EvolutionCardState, EvolutionTierBoost,
EvolutionCosmetic), their re-export module, and tests were included in
this PR without disclosure. Removed to keep this PR scoped to
PlayerSeasonStats (WP-02) only per review feedback.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
