chore: release v4.0.0 - sync 550+ skills and restructure docs

skills/microservices-patterns/SKILL.md

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+---
+name: microservices-patterns
+description: Design microservices architectures with service boundaries, event-driven communication, and resilience patterns. Use when building distributed systems, decomposing monoliths, or implementing microservices.
+---
+
+# Microservices Patterns
+
+Master microservices architecture patterns including service boundaries, inter-service communication, data management, and resilience patterns for building distributed systems.
+
+## Use this skill when
+
+- Decomposing monoliths into microservices
+- Designing service boundaries and contracts
+- Implementing inter-service communication
+- Managing distributed data and transactions
+- Building resilient distributed systems
+- Implementing service discovery and load balancing
+- Designing event-driven architectures
+
+## Do not use this skill when
+
+- The system is small enough for a modular monolith
+- You need a quick prototype without distributed complexity
+- There is no operational support for distributed systems
+
+## Instructions
+
+1. Identify domain boundaries and ownership for each service.
+2. Define contracts, data ownership, and communication patterns.
+3. Plan resilience, observability, and deployment strategy.
+4. Provide migration steps and operational guardrails.
+
+## Resources
+
+- `resources/implementation-playbook.md` for detailed patterns and examples.