Build a MLB box score

A box score is one game plus the per-player stat lines for both teams. Find a game, fetch its player stats, and join them back to the players and teams.

1. Find a game
List games for a season to get the game id you want a box score for. Each row carries home_team_id / away_team_id and the final score.
```
curl -sS \
  -H 'Authorization: Bearer YOUR_API_KEY' \
  'https://api.stat-api.com/api/v1/mlb/games?season_id=2026&limit=20'
```
2. Pull per-player stats for that game
game_player_batter_stats is keyed by game_id — one row per player who appeared. Each row carries team_id and player_id foreign keys. Swap GAME_ID for an id from step 1.
```
curl -sS \
  -H 'Authorization: Bearer YOUR_API_KEY' \
  'https://api.stat-api.com/api/v1/mlb/game_player_batter_stats?game_id=GAME_ID'
```

3. Join players and teams

Group the stat lines by team_id to render the two halves of the box score; resolve player_id and team_id to names with the lookups in the Data Dictionary.

const headers = { Authorization: 'Bearer YOUR_API_KEY' }
const base = 'https://api.stat-api.com/api/v1/mlb'

const stats = await fetch(`${base}/game_player_batter_stats?game_id=GAME_ID`, { headers })
  .then(r => r.json())

// Group the stat lines by team to render both halves of the box score.
const byTeam = Map.groupBy(
  stats.game_player_batter_stats,
  (s: { team_id: number }) => s.team_id,
)

1. Find a game

2. Pull per-player stats for that game

3. Join players and teams