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/hubspot-integration/SKILL.md

@@ -0,0 +1,42 @@
+---
+name: hubspot-integration
+description: "Expert patterns for HubSpot CRM integration including OAuth authentication, CRM objects, associations, batch operations, webhooks, and custom objects. Covers Node.js and Python SDKs. Use when: hubspot, hubspot api, hubspot crm, hubspot integration, contacts api."
+source: vibeship-spawner-skills (Apache 2.0)
+---
+
+# HubSpot Integration
+
+## Patterns
+
+### OAuth 2.0 Authentication
+
+Secure authentication for public apps
+
+### Private App Token
+
+Authentication for single-account integrations
+
+### CRM Object CRUD Operations
+
+Create, read, update, delete CRM records
+
+## Anti-Patterns
+
+### ❌ Using Deprecated API Keys
+
+### ❌ Individual Requests Instead of Batch
+
+### ❌ Polling Instead of Webhooks
+
+## ⚠️ Sharp Edges
+
+| Issue | Severity | Solution |
+|-------|----------|----------|
+| Issue | high | See docs |
+| Issue | high | See docs |
+| Issue | critical | See docs |
+| Issue | high | See docs |
+| Issue | critical | See docs |
+| Issue | medium | See docs |
+| Issue | high | See docs |
+| Issue | medium | See docs |