Add products for v1

Open data/products.json. Add a category if you need one, then add a product object:

{
  "id": "mercury-impeller-90",
  "slug": "mercury-impeller-90",
  "name": "Mercury 90 impeller kit",
  "category": "engine",
  "sku": "MER-IMP-90",
  "examplePriceCents": 5299,
  "shortDescription": "Water pump kit for 90 hp Mercury.",
  "description": "Fits … Confirm year and model before pickup.",
  "isDemo": false,
  "inStock": true,
  "notes": ""
}

• Prices are integer cents CAD (5299 = $52.99). The field is still named examplePriceCents so demo data stays honest.
• Set isDemo to false when the SKU is real shop stock.
• Redeploy on Vercel after you push. There is no in-browser save — serverless hosts cannot write this file.
• Later option: Square Catalog + the existing Payment Links checkout. Keep JSON until the catalog is stable.