Add Vercel power

vercel/POWER.md

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+---
+name: "vercel-deployment"
+displayName: "Vercel Deployment"
+description: "Deploy and manage websites on Vercel using CLI-first workflow with vercel.json configuration"
+keywords: ["vercel", "deploy", "hosting", "cli", "deployment", "web", "nextjs", "serverless"]
+author: "Vercel"
+---
+
+# Vercel Deployment (CLI-First)
+
+> Use this file whenever you are asked to deploy or update a site on Vercel.
+> **Default behavior:** prefer the Vercel CLI.
+
+## 1. Defaults & Principles
+
+- Prefer **Vercel CLI** as the primary deployment method.
+- **Preview before production**: always deploy to preview first, then promote.
+- Vercel **auto-detects** frameworks (Next.js, Nuxt, SvelteKit, Vite, Astro, etc.) — only override when necessary.
+- Use `vercel.json` only when customizing defaults. Most projects need none.
+- Never hardcode secrets; use **Vercel environment variables**.
+- For framework-specific details, run `vercel help` or reference official Vercel docs rather than inventing patterns.
+
+## 2. Deploy with Vercel CLI (Preferred)
+
+### Install & Authenticate
+
+```bash
+npm install -g vercel
+
+# Check if already logged in
+vercel whoami
+
+# Only if not logged in
+vercel login
+```
+
+### Link or Create a Project
+
+Check if the project is already linked by looking for a `.vercel` directory.
+
+If not already linked:
+
+1. Run `vercel link` for interactive linking.
+2. If the project doesn't exist on Vercel yet, run `vercel` — it will create the project and deploy in one step.
+3. For monorepos, use `vercel link --repo`.
+
+### Dependencies
+
+Confirm all dependencies are installed (e.g., `npm install`) before deploying.
+
+### Deploy
+
+If creating a new project, do a preview deploy first.
+If linking an existing project, create a preview deploy unless the user explicitly asked for production.
+
+```bash
+# Preview deploy (default — always do this first)
+vercel
+
+# Production deploy (only when explicitly requested or after preview is verified)
+vercel --prod
+
+# Force rebuild, skip cache
+vercel --force
+
+# Deploy without waiting for completion
+vercel --no-wait
+```
+
+### After Deploying
+
+```bash
+# Check deployment status and details
+vercel inspect <deployment-url>
+
+# View build logs if something failed
+vercel logs <deployment-url>
+
+# Promote a preview to production
+vercel promote <deployment-url>
+
+# Rollback production to previous deployment
+vercel rollback
+
+# Test an endpoint with automatic auth bypass
+vercel curl /api/health
+```
+
+## 3. Environment Variables
+
+```bash
+# List current env vars
+vercel env ls
+
+# Add a variable (interactive — prompts for environment)
+vercel env add
+
+# Pull all env vars to local .env.local
+vercel env pull
+
+# Run a command with env vars loaded (no file written)
+vercel env run -- npm run dev
+```
+
+- Variables are scoped to **development**, **preview**, and **production**.
+- Use `vercel env pull` before local development to stay in sync.
+
+## 4. vercel.json (Only When Needed)
+
+Most projects work without any configuration. Only add `vercel.json` when you need to customize behavior.
+
+```json
+{
+  "$schema": "https://openapi.vercel.sh/vercel.json"
+}
+```
+
+Common reasons to add config:
+
+| Need | Property |
+|------|----------|
+| Override build command | `"buildCommand": "npm run build"` |
+| Override output directory | `"outputDirectory": "dist"` |
+| Set function regions | `"regions": ["iad1"]` |
+| Add redirects/rewrites | `"redirects"` / `"rewrites"` |
+| Configure cron jobs | `"crons": [{"path": "/api/cron", "schedule": "0 5 * * *"}]` |
+| Set function limits | `"functions": {"api/**/*.js": {"maxDuration": 30}}` |
+
+Do not duplicate framework defaults. If Vercel auto-detects correctly, leave it alone.
+
+## 5. Troubleshooting
+
+```bash
+# Build failed — check logs
+vercel logs <deployment-url>
+
+# Deployment stuck — force rebuild
+vercel --force
+
+# Env vars missing locally — sync them
+vercel env pull
+
+# Cache issues — purge CDN or data cache
+vercel cache purge
+
+# Check HTTP timing on a deployment endpoint
+vercel httpstat /api/health
+
+# Open project dashboard in browser
+vercel open
+```
+
+- Functions default to `iad1` (Washington D.C.) — set region close to your data source.
+- Cron schedules are **UTC**, not local timezone.
+- If `vercel inspect` shows the deployment is still building, use `vercel inspect <url> --wait`.