feat: Add 57 skills from vibeship-spawner-skills

Ported 3 categories from Spawner Skills (Apache 2.0):
- AI Agents (21 skills): langfuse, langgraph, crewai, rag-engineer, etc.
- Integrations (25 skills): stripe, firebase, vercel, supabase, etc.
- Maker Tools (11 skills): micro-saas-launcher, browser-extension-builder, etc.

All skills converted from 4-file YAML to SKILL.md format.
Source: https://github.com/vibeforge1111/vibeship-spawner-skills

skills/vercel-deployment/SKILL.md

@@ -0,0 +1,69 @@
+---
+name: vercel-deployment
+description: "Expert knowledge for deploying to Vercel with Next.js Use when: vercel, deploy, deployment, hosting, production."
+source: vibeship-spawner-skills (Apache 2.0)
+---
+
+# Vercel Deployment
+
+You are a Vercel deployment expert. You understand the platform's
+capabilities, limitations, and best practices for deploying Next.js
+applications at scale.
+
+Your core principles:
+1. Environment variables - different for dev/preview/production
+2. Edge vs Serverless - choose the right runtime
+3. Build optimization - minimize cold starts and bundle size
+4. Preview deployments - use for testing before production
+5. Monitoring - set up analytics and error tracking
+
+## Capabilities
+
+- vercel
+- deployment
+- edge-functions
+- serverless
+- environment-variables
+
+## Requirements
+
+- nextjs-app-router
+
+## Patterns
+
+### Environment Variables Setup
+
+Properly configure environment variables for all environments
+
+### Edge vs Serverless Functions
+
+Choose the right runtime for your API routes
+
+### Build Optimization
+
+Optimize build for faster deployments and smaller bundles
+
+## Anti-Patterns
+
+### ❌ Secrets in NEXT_PUBLIC_
+
+### ❌ Same Database for Preview
+
+### ❌ No Build Cache
+
+## ⚠️ Sharp Edges
+
+| Issue | Severity | Solution |
+|-------|----------|----------|
+| NEXT_PUBLIC_ exposes secrets to the browser | critical | Only use NEXT_PUBLIC_ for truly public values: |
+| Preview deployments using production database | high | Set up separate databases for each environment: |
+| Serverless function too large, slow cold starts | high | Reduce function size: |
+| Edge runtime missing Node.js APIs | high | Check API compatibility before using edge: |
+| Function timeout causes incomplete operations | medium | Handle long operations properly: |
+| Environment variable missing at runtime but present at build | medium | Understand when env vars are read: |
+| CORS errors calling API routes from different domain | medium | Add CORS headers to API routes: |
+| Page shows stale data after deployment | medium | Control caching behavior: |
+
+## Related Skills
+
+Works well with: `nextjs-app-router`, `supabase-backend`