Phase 0 research resolves the business-calendar working-hours algorithm
(day-by-day walk via luxon, the first date/timezone dependency in this
codebase), the workingHours JSON shape, most-specific SLA-policy match
(reusing 005/006's resolution pattern), durable pause/resume (absolute
due-date shift, no in-memory state), and a repeatable-job breach-detection
design over per-run delayed jobs. Phase 1 adds data-model.md (one additive
refinement beyond doc06: SLARun.firstResponseBreachedAt), the admin/read
contract, and six quickstart scenarios including a genuine process-restart
boundary test for Constitution Principle VII.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
