THE HUB VIEW. Aggregate the user's teams across ALL their configured leagues and providers (Fantrax, ESPN, Sleeper) in ONE call. The user plays in MULTIPLE leagues at once, so use this whenever they ask about "my teams", "my football teams", "how am I doing", "my week", or anything plural/cross-league. Do NOT just query one league.
Args: sport (optional, e.g. 'NFL' for "my football teams"; omit for all sports); provider (optional filter); response_format. For each team it returns the league, your team, rank/record, and this week's matchup. Needs a connected profile (reads your configured leagues). For a single named league, use fantasy_get_my_team instead.