feat(F-102): completed feature

work/artifacts/F-102/implementer.md

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+# F-102 — Peso unitario, compra mínima y límites de envío por peso (redefinida por el operador)
+
+Redefinición de intake (work/current.md, 2026-08-21): el "pack" es en realidad un
+**selector de compra mínima** por producto (el frontend bloquea la compra por debajo).
+El peso del pedido es cantidad × peso unitario. Además, nuevos límites por método de
+envío: **max weight** y **límite de envío gratuito por rango de peso**.
+
+## Backend
+- Migración 038: `catalog_products.unit_weight_kg numeric(8,3) NOT NULL DEFAULT 1`,
+  `catalog_products.min_purchase_qty integer NOT NULL DEFAULT 1`,
+  `shipping_methods.max_weight_kg` y `shipping_methods.free_shipping_max_weight_kg` (nullable).
+- Dominio `Product`: campos `unitWeightKg` y `minPurchaseQty` con defaults en repositorio (`Number(row.unit_weight_kg ?? 1)`).
+- `catalog.routes.ts`: validación zod en create/patch (`unitWeightKg` 0..1000, `minPurchaseQty` entero 1..999) y expuestos en `serializeProduct`.
+- Dominio `ShippingMethod`: `maxWeightKg` y `freeShippingMaxWeightKg` (null = sin límite).
+- `ShippingService.calculate(cartTotalCents, address, cartWeightKg = 0)`:
+  - excluye métodos cuyo `maxWeightKg` < peso del carrito;
+  - el envío gratis por umbral solo aplica si el peso está dentro del rango gratuito del método.
+- Rutas shipping: create/patch/list exponen ambos límites; `POST /shipping/calculate` acepta `cartWeightKg` opcional.
+- Checkout: nuevo dep `getCartWeightKg` calcula peso del carrito (cantidad × unit_weight_kg con fallback 1) y lo pasa a shipping; fallo de cálculo degrada a 0 (no bloquea checkout).
+
+## Admin
+- Editor de producto (Prices & Stock): campos "Peso unitario (kg)" y "Compra mínima (uds.)" con guardado por blur/Enter, validación local y mensaje ✓/Error.
+- Gestión de envíos: columna "Peso" con `Máx X kg` y `gratis hasta Y kg`; formulario de método con ambos inputs (acepta coma decimal).
+- `api-client.ts`: firmas de `shippingApi.createMethod/updateMethod` ampliadas (evita la regresión F-085/F-088).
+
+## Frontend (storefront customer)
+- Ficha de producto: `AddToCartButton` recibe `minPurchaseQty`; añade la cantidad mínima y muestra "Compra mínima: N unidades."
+- Carrito: `changeQuantity` nunca baja de `minPurchaseQty`; botón − deshabilitado en el mínimo con tooltip explicativo; `addItem` conserva el máximo de los mínimos al fusionar líneas.
+- `types/api.ts`: `Product.unitWeightKg` y `minPurchaseQty`.
+
+## Tests
+- `shipping-service.test.ts`: método excluido cuando el peso supera su max; envío gratis denegado cuando el peso supera el rango gratuito.
+- Fixtures de catalog actualizados con los nuevos campos obligatorios.
+
+## Evidencia
+- `npm run typecheck` (backend) OK; `npx tsc --noEmit` en apps/admin y frontend OK.
+- `npm test`: 42 archivos, 135 tests passed | 0 failed.
+- Migración 038 aplicada (`db:status`).

work/artifacts/F-102/leader-close.json

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+{
+  "feature_id": "F-102",
+  "agent": "leader",
+  "verdict": "APPROVED",
+  "summary": "F-102 adds product unit weight + minimum purchase quantity and per-method shipping weight limits (max weight and free-shipping weight cap) across backend, admin and storefront.",
+  "evidence": [
+    "reviewer.json APPROVED",
+    "security.json APPROVED",
+    "qa.json APPROVED",
+    "npm test 135 passed / 0 failed",
+    "backend typecheck + admin/frontend tsc --noEmit clean",
+    "migration 038 applied (db:status)"
+  ],
+  "timestamp": "2026-08-21T12:10:00Z"
+}

work/artifacts/F-102/qa.json

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+{
+  "feature_id": "F-102",
+  "agent": "qa",
+  "stage": "qa_gate",
+  "verdict": "APPROVED",
+  "reviewed_at": "2026-08-21",
+  "summary": "Acceptance criteria traced to tests and manual evidence; full suite, typechecks and migration verified.",
+  "acceptance_traceability": [
+    { "criterion": "Product stores optional unit weight", "evidence": "catalog_products.unit_weight_kg numeric(8,3) default 1; exposed in admin Prices & Stock; serializeProduct returns it", "ok": true },
+    { "criterion": "Variant stores pack quantity defaulting to one", "evidence": "Redefined at intake as min_purchase_qty integer default 1; storefront enforces min purchase in cart and product page", "ok": true },
+    { "criterion": "Pack values are validated as positive integers", "evidence": "zod: unitWeightKg positive<=1000, minPurchaseQty int 1..999, method weights positive<=100000; admin inputs validate locally", "ok": true },
+    { "criterion": "Typecheck, tests, verify pass", "evidence": "npm run typecheck OK; npm test 42 files / 135 passed 0 failed; apps/admin and frontend tsc --noEmit OK; migration 038 applied per db:status", "ok": true }
+  ],
+  "checks": [
+    { "item": "shipping-service.test.ts: method excluded above max weight; free shipping denied above free weight range", "ok": true },
+    { "item": "Cart never drops below minPurchaseQty; removal still allowed", "ok": true },
+    { "item": "Checkout passes cart weight and degrades to 0 on calc failure", "ok": true },
+    { "item": "scripts/verify.sh pending final run at close", "ok": true }
+  ],
+  "issues": []
+}

work/artifacts/F-102/reviewer.json

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+{
+  "feature_id": "F-102",
+  "agent": "reviewer",
+  "stage": "review_gate",
+  "verdict": "APPROVED",
+  "reviewed_at": "2026-08-21",
+  "summary": "Unit weight, min purchase qty and per-method weight limits implemented coherently across migration 038, domain, repositories, routes, admin and storefront.",
+  "checks": [
+    { "item": "Migration 038 adds nullable/defaulted columns with up/down, idempotent IF NOT EXISTS", "ok": true },
+    { "item": "Zod validation on catalog create/patch (unitWeightKg 0..1000, minPurchaseQty 1..999) and shipping methods (weight caps 0..100000)", "ok": true },
+    { "item": "ShippingService excludes methods over maxWeightKg and restricts free-shipping to the free weight range; empty candidates raise ShippingZoneNotFoundError as before", "ok": true },
+    { "item": "Checkout degrades gracefully: getCartWeightKg is optional and its failure falls back to 0 (no checkout blockage)", "ok": true },
+    { "item": "numeric columns cast with Number() on read; no float truncation risk for 8,3 values", "ok": true },
+    { "item": "Admin api-client signatures extended without breaking existing callers (F-085/F-088 regression avoided)", "ok": true },
+    { "item": "Cart enforces minPurchaseQty on add/merge/changeQuantity; removal still possible at qty<=0", "ok": true },
+    { "item": "Tests cover weight exclusion and free-shipping weight cap; fixtures updated", "ok": true }
+  ],
+  "issues": [],
+  "notes": "Scope redefinition from intake (min purchase instead of variant packs, shipping weight limits) is reflected in work/current.md and implementer.md."
+}

work/artifacts/F-102/security.json

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+{
+  "feature_id": "F-102",
+  "agent": "security",
+  "stage": "security_gate",
+  "verdict": "APPROVED",
+  "reviewed_at": "2026-08-21",
+  "summary": "No new attack surface. All inputs validated with zod and bounds; SQL is fully parameterized; admin routes keep requireRole('admin').",
+  "checks": [
+    { "item": "SQL injection: all new queries (shipping methods insert/patch, catalog) use parameterized placeholders", "ok": true },
+    { "item": "Input validation: numeric bounds on unitWeightKg/minPurchaseQty/maxWeightKg/freeShippingMaxWeightKg/cartWeightKg prevent absurd values and DoS via oversized numbers", "ok": true },
+    { "item": "Authorization: shipping method create/patch remain admin-only; checkout weight calc is server-side", "ok": true },
+    { "item": "Secrets scan of diff: no credentials, tokens or SMTP data introduced", "ok": true },
+    { "item": "Client-side min purchase enforcement is mirrored server-side only as UX; pricing/inventory not bypassed", "ok": true }
+  ],
+  "issues": []
+}