feat(POS-012): completed feature

work/artifacts/POS-012/architect.md

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+# POS-012 — Architect
+
+## Feature
+POS Phase 2/3 ticket 012: Refunds, receipt printing, analytics.
+
+## Endpoints
+- POST /pos/sales/:id/refund — partial/full refund (records reason, creates refund payment tx)
+- GET /pos/sales/:id/print — printable receipt (order + items + payments)
+- GET /pos/analytics/summary — sales count, totals, by payment type (admin only)