Tidewatch is a Python scoring engine that tells agents and humans which obligation to work on next. Six math-driven factors — deadline decay, materiality, dependency fanout, completion state, timing sensitivity, violation history — produce a single pressure score per task. Unlike binary overdue/not-overdue systems, pressure accumulates continuously as deadlines approach. Zero dependencies, 659 tests, 97% coverage. Scores 500K items in <5 seconds. Apache-2.0 + commercial dual license.