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

skills/protocol-reverse-engineering/SKILL.md

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+---
+name: protocol-reverse-engineering
+description: Master network protocol reverse engineering including packet analysis, protocol dissection, and custom protocol documentation. Use when analyzing network traffic, understanding proprietary protocols, or debugging network communication.
+---
+
+# Protocol Reverse Engineering
+
+Comprehensive techniques for capturing, analyzing, and documenting network protocols for security research, interoperability, and debugging.
+
+## Use this skill when
+
+- Working on protocol reverse engineering tasks or workflows
+- Needing guidance, best practices, or checklists for protocol reverse engineering
+
+## Do not use this skill when
+
+- The task is unrelated to protocol reverse engineering
+- You need a different domain or tool outside this scope
+
+## Instructions
+
+- Clarify goals, constraints, and required inputs.
+- Apply relevant best practices and validate outcomes.
+- Provide actionable steps and verification.
+- If detailed examples are required, open `resources/implementation-playbook.md`.
+
+## Resources
+
+- `resources/implementation-playbook.md` for detailed patterns and examples.