Replace custom _make_game/_make_team helpers with existing test
factories for consistency with the rest of the test suite.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Closes#88
Replaced sequential for-loops in get_team_schedule(), get_recent_games(),
and get_upcoming_games() with asyncio.gather() to fire all per-week HTTP
requests concurrently. Also adds import asyncio which was missing.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>