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

skills/changelog-automation/SKILL.md

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+---
+name: changelog-automation
+description: Automate changelog generation from commits, PRs, and releases following Keep a Changelog format. Use when setting up release workflows, generating release notes, or standardizing commit conventions.
+---
+
+# Changelog Automation
+
+Patterns and tools for automating changelog generation, release notes, and version management following industry standards.
+
+## Use this skill when
+
+- Setting up automated changelog generation
+- Implementing conventional commits
+- Creating release note workflows
+- Standardizing commit message formats
+- Managing semantic versioning
+
+## Do not use this skill when
+
+- The project has no release process or versioning
+- You only need a one-time manual release note
+- Commit history is unavailable or unreliable
+
+## Instructions
+
+- Select a changelog format and versioning strategy.
+- Enforce commit conventions or labeling rules.
+- Configure tooling to generate and publish notes.
+- Review output for accuracy, completeness, and wording.
+- If detailed examples are required, open `resources/implementation-playbook.md`.
+
+## Safety
+
+- Avoid exposing secrets or internal-only details in release notes.
+
+## Resources
+
+- `resources/implementation-playbook.md` for detailed patterns, templates, and examples.