feat(POS-011): completed feature

work/artifacts/POS-011/implementer.md

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+# POS-011 — Implementer evidence
+
+## What
+Added: GET /pos/sales, POST /pos/sales/:id/void, GET /pos/sales/:id/receipt, GET /pos/sessions. tsc 0, verify verde.
+
+## Files
+- `src/modules/pos/api/pos.routes.ts` — 4 new routes added
+
+## Verification
+- `npm run build` → 0 TypeScript errors.
+- `./scripts/verify.sh` → green.