work_log_payroll_ajax serializes the helper's output to JSON with
floats (not Decimals), ISO dates, and payroll_record/worker IDs for
client-side link construction. Admin-only; supervisor = 403, anon =
302, unknown log = 404. Matches the worker_lookup_ajax pattern.
Added 4 view-level tests (total 16 passing).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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