Adds a consolidated regression test to WorkLogPayrollAjaxTests that
exercises: paid worker serialization shape, null team branch, OT flag
in JSON, full_page_url value, and adjustment payslip-link serialization.
Closes the 'Important' coverage gap flagged in Task 3's quality review.
Also appends a 'Shipped' block to the design doc summarising QA
status and capturing all five deferred nits (admin-gate consistency,
template branch tests, |default:0 redundancy, admin-gate expression
readability, background vs background-color) so they survive the
merge into project history.
All 19 tests pass. manage.py check clean. No migrations needed.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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