Smarter rankings: backtest, confirmed lineups, corrected parks

The model got measurably sharper — now validated against a full prior season, upgrading to confirmed starting lineups as they post, with corrected home-run factors for all 30 ballparks.

• Validated against a complete prior MLB season, so rankings rest on real, measured results rather than theory.
• Rankings refresh to the confirmed batting order once lineups post on game day, instead of relying only on a morning estimate.
• Refreshed home-run factors for all 30 ballparks using the latest season data, correcting several parks that had been materially over- or under-rated.