96ac44fbef
The daily-challenge seed function had no unit test coverage. Added tests for determinism, cross-day and cross-year distinctness, non-zero output, and all six generate_goal variants (score/time field correctness). This acts as a change-detection guard for the authoritative seed algorithm that all players worldwide rely on to receive the same daily deal. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>