Tweaks n improvements

[mborrus]

CI/CD:

• tests on tests/ + /src
• bump actions version
• Drop mypy from CI (only pytest + flake8 remain)
• add flake8 linting

Core utils (cbbpy_utils.py):

• return empty df's instead of Nones to prevent downstream errors when empty
• some other errors handling
• extract team helpers to be make more modular
• consolidate json extraction logic
• cache csv reads

Data

• Add New Haven Chargers (2026, NEC) to both mens_team_map.csv and womens_team_map.csv

Tests (tests/test_utils.py)

• 184 lines of unit tests covering: _parse_date, _get_current_season, _get_team_map (including cache verification), _get_id_from_team, _get_season_conferences, _get_teams_from_conference, and all three boxscore helper
  functions

[mborrus]

last commit adds de-duplification, improved regex extraction of players, tighter tests, defensive bounds checks on stats list

[dcstats]

@mborrus amazing I will take a look at this as soon as i get some time, thanks so much!!