feat: config unification — Duration migration + OutboxPurgerConfig (KOJAK-61)#16

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endrju19 wants to merge 8 commits intomainfrom

kojak-61-config-unification

Commits on Apr 2, 2026

cleanup: remove warn log from PurgerConfig, use static Duration imports in tests (KOJAK-61)
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simplify: collapse redundant interval validation (KOJAK-61)
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