Pure-function helper that classifies each worker on a work log as
Paid / Priced-not-paid / Unpaid, collects log-linked adjustments,
and computes totals + pay-period context. Used by both the AJAX
endpoint and the full-page view so they can't drift.
Bootstraps core/tests.py (was empty); 8 tests cover the three
statuses, totals, log-linked adjustments, and the pay-period branch.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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