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

skills/competitive-landscape/SKILL.md

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+---
+name: competitive-landscape
+description: This skill should be used when the user asks to "analyze
+  competitors", "assess competitive landscape", "identify differentiation",
+  "evaluate market positioning", "apply Porter's Five Forces", or requests
+  competitive strategy analysis.
+metadata:
+  version: 1.0.0
+---
+
+# Competitive Landscape Analysis
+
+Comprehensive frameworks for analyzing competition, identifying differentiation opportunities, and developing winning market positioning strategies.
+
+## Use this skill when
+
+- Working on competitive landscape analysis tasks or workflows
+- Needing guidance, best practices, or checklists for competitive landscape analysis
+
+## Do not use this skill when
+
+- The task is unrelated to competitive landscape analysis
+- 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.