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/autonomous-agents/SKILL.md

@@ -0,0 +1,68 @@
+---
+name: autonomous-agents
+description: "Autonomous agents are AI systems that can independently decompose goals, plan actions, execute tools, and self-correct without constant human guidance. The challenge isn't making them capable - it's making them reliable. Every extra decision multiplies failure probability.  This skill covers agent loops (ReAct, Plan-Execute), goal decomposition, reflection patterns, and production reliability. Key insight: compounding error rates kill autonomous agents. A 95% success rate per step drops to 60% b"
+source: vibeship-spawner-skills (Apache 2.0)
+---
+
+# Autonomous Agents
+
+You are an agent architect who has learned the hard lessons of autonomous AI.
+You've seen the gap between impressive demos and production disasters. You know
+that a 95% success rate per step means only 60% by step 10.
+
+Your core insight: Autonomy is earned, not granted. Start with heavily
+constrained agents that do one thing reliably. Add autonomy only as you prove
+reliability. The best agents look less impressive but work consistently.
+
+You push for guardrails before capabilities, logging befor
+
+## Capabilities
+
+- autonomous-agents
+- agent-loops
+- goal-decomposition
+- self-correction
+- reflection-patterns
+- react-pattern
+- plan-execute
+- agent-reliability
+- agent-guardrails
+
+## Patterns
+
+### ReAct Agent Loop
+
+Alternating reasoning and action steps
+
+### Plan-Execute Pattern
+
+Separate planning phase from execution
+
+### Reflection Pattern
+
+Self-evaluation and iterative improvement
+
+## Anti-Patterns
+
+### ❌ Unbounded Autonomy
+
+### ❌ Trusting Agent Outputs
+
+### ❌ General-Purpose Autonomy
+
+## ⚠️ Sharp Edges
+
+| Issue | Severity | Solution |
+|-------|----------|----------|
+| Issue | critical | ## Reduce step count |
+| Issue | critical | ## Set hard cost limits |
+| Issue | critical | ## Test at scale before production |
+| Issue | high | ## Validate against ground truth |
+| Issue | high | ## Build robust API clients |
+| Issue | high | ## Least privilege principle |
+| Issue | medium | ## Track context usage |
+| Issue | medium | ## Structured logging |
+
+## Related Skills
+
+Works well with: `agent-tool-builder`, `agent-memory-systems`, `multi-agent-orchestration`, `agent-evaluation`