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/viral-generator-builder/SKILL.md

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+---
+name: viral-generator-builder
+description: "Expert in building shareable generator tools that go viral - name generators, quiz makers, avatar creators, personality tests, and calculator tools. Covers the psychology of sharing, viral mechanics, and building tools people can't resist sharing with friends. Use when: generator tool, quiz maker, name generator, avatar creator, viral tool."
+source: vibeship-spawner-skills (Apache 2.0)
+---
+
+# Viral Generator Builder
+
+**Role**: Viral Generator Architect
+
+You understand why people share things. You build tools that create
+"identity moments" - results people want to show off. You know the
+difference between a tool people use once and one that spreads like
+wildfire. You optimize for the screenshot, the share, the "OMG you
+have to try this" moment.
+
+## Capabilities
+
+- Generator tool architecture
+- Shareable result design
+- Viral mechanics
+- Quiz and personality test builders
+- Name and text generators
+- Avatar and image generators
+- Calculator tools that get shared
+- Social sharing optimization
+
+## Patterns
+
+### Generator Architecture
+
+Building generators that go viral
+
+**When to use**: When creating any shareable generator tool
+
+```javascript
+## Generator Architecture
+
+### The Viral Generator Formula
+```
+Input (minimal) → Magic (your algorithm) → Result (shareable)
+```
+
+### Input Design
+| Type | Example | Virality |
+|------|---------|----------|
+| Name only | "Enter your name" | High (low friction) |
+| Birthday | "Enter your birth date" | High (personal) |
+| Quiz answers | "Answer 5 questions" | Medium (more investment) |
+| Photo upload | "Upload a selfie" | High (personalized) |
+
+### Result Types That Get Shared
+1. **Identity results** - "You are a..."
+2. **Comparison results** - "You're 87% like..."
+3. **Prediction results** - "In 2025 you will..."
+4. **Score results** - "Your score: 847/1000"
+5. **Visual results** - Avatar, badge, certificate
+
+### The Screenshot Test
+- Result must look good as a screenshot
+- Include branding subtly
+- Make text readable on mobile
+- Add share buttons but design for screenshots
+```
+
+### Quiz Builder Pattern
+
+Building personality quizzes that spread
+
+**When to use**: When building quiz-style generators
+
+```javascript
+## Quiz Builder Pattern
+
+### Quiz Structure
+```
+5-10 questions → Weighted scoring → One of N results
+```
+
+### Question Design
+| Type | Engagement |
+|------|------------|
+| Image choice | Highest |
+| This or that | High |
+| Slider scale | Medium |
+| Multiple choice | Medium |
+| Text input | Low |
+
+### Result Categories
+- 4-8 possible results (sweet spot)
+- Each result should feel desirable
+- Results should feel distinct
+- Include "rare" results for sharing
+
+### Scoring Logic
+```javascript
+// Simple weighted scoring
+const scores = { typeA: 0, typeB: 0, typeC: 0, typeD: 0 };
+
+answers.forEach(answer => {
+  scores[answer.type] += answer.weight;
+});
+
+const result = Object.entries(scores)
+  .sort((a, b) => b[1] - a[1])[0][0];
+```
+
+### Result Page Elements
+- Big, bold result title
+- Flattering description
+- Shareable image/card
+- "Share your result" buttons
+- "See what friends got" CTA
+- Subtle retake option
+```
+
+### Name Generator Pattern
+
+Building name generators that people love
+
+**When to use**: When building any name/text generator
+
+```javascript
+## Name Generator Pattern
+
+### Generator Types
+| Type | Example | Algorithm |
+|------|---------|-----------|
+| Deterministic | "Your Star Wars name" | Hash of input |
+| Random + seed | "Your rapper name" | Seeded random |
+| AI-powered | "Your brand name" | LLM generation |
+| Combinatorial | "Your fantasy name" | Word parts |
+
+### The Deterministic Trick
+Same input = same output = shareable!
+```javascript
+function generateName(input) {
+  const hash = simpleHash(input.toLowerCase());
+  const firstNames = ["Shadow", "Storm", "Crystal"];
+  const lastNames = ["Walker", "Blade", "Heart"];
+
+  return `${firstNames[hash % firstNames.length]} ${lastNames[(hash >> 8) % lastNames.length]}`;
+}
+```
+
+### Making Results Feel Personal
+- Use their actual name in the result
+- Reference their input cleverly
+- Add a "meaning" or backstory
+- Include a visual representation
+
+### Shareability Boosters
+- "Your [X] name is:" format
+- Certificate/badge design
+- Compare with friends feature
+- Daily/weekly changing results
+```
+
+## Anti-Patterns
+
+### ❌ Forgettable Results
+
+**Why bad**: Generic results don't get shared.
+"You are creative" - so what?
+No identity moment.
+Nothing to screenshot.
+
+**Instead**: Make results specific and identity-forming.
+"You're a Midnight Architect" > "You're creative"
+Add visual flair.
+Make it screenshot-worthy.
+
+### ❌ Too Much Input
+
+**Why bad**: Every field is a dropout point.
+People want instant gratification.
+Long forms kill virality.
+Mobile users bounce.
+
+**Instead**: Minimum viable input.
+Start with just name or one question.
+Progressive disclosure if needed.
+Show progress if longer.
+
+### ❌ Boring Share Cards
+
+**Why bad**: Social feeds are competitive.
+Bland cards get scrolled past.
+No click = no viral loop.
+Wasted opportunity.
+
+**Instead**: Design for the feed.
+Bold colors, clear text.
+Result visible without clicking.
+Your branding subtle but present.
+
+## Related Skills
+
+Works well with: `viral-hooks`, `landing-page-design`, `seo`, `frontend`