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

skills/bats-testing-patterns/SKILL.md

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+---
+name: bats-testing-patterns
+description: Master Bash Automated Testing System (Bats) for comprehensive shell script testing. Use when writing tests for shell scripts, CI/CD pipelines, or requiring test-driven development of shell utilities.
+---
+
+# Bats Testing Patterns
+
+Comprehensive guidance for writing comprehensive unit tests for shell scripts using Bats (Bash Automated Testing System), including test patterns, fixtures, and best practices for production-grade shell testing.
+
+## Use this skill when
+
+- Writing unit tests for shell scripts
+- Implementing TDD for scripts
+- Setting up automated testing in CI/CD pipelines
+- Testing edge cases and error conditions
+- Validating behavior across shell environments
+
+## Do not use this skill when
+
+- The project does not use shell scripts
+- You need integration tests beyond shell behavior
+- The goal is only linting or formatting
+
+## Instructions
+
+- Confirm shell dialects and supported environments.
+- Set up a test structure with helpers and fixtures.
+- Write tests for exit codes, output, and side effects.
+- Add setup/teardown and run tests in CI.
+- If detailed examples are required, open `resources/implementation-playbook.md`.
+
+## Resources
+
+- `resources/implementation-playbook.md` for detailed patterns and examples.