feat(F-187): completed feature

work/artifacts/F-187/documenter.md

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+# F-187 — Documentation
+
+Updated `docs/pos/POS_CHECKOUT.md` with:
+
+- cashier active/inactive/deleted semantics;
+- session revocation and fresh-login behavior;
+- irreversible soft deletion and historical-attribution guarantee;
+- mandatory cash-session close before removal;
+- admin lifecycle API endpoints and role restrictions;
+- audit event behavior.
+
+Removed F-187 from the future-work list now that the lifecycle is implemented.