feat(POS-011): completed feature

work/artifacts/POS-011/architect.md

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+# POS-011 — Architect
+
+## Feature
+POS Phase 2/3 ticket 011: POS sales operations (list, void, receipts) + session history.
+
+## Endpoints
+- GET /pos/sales — list recent sales (by sessionId filter)
+- POST /pos/sales/:id/void — void a sale (admin only, records reason)
+- GET /pos/sales/:id/receipt — get full receipt (order + items + payments)
+- GET /pos/sessions — list cash sessions (admin only)