Migrate: Replace ci-design-md-check.sh with JavaScript

[ashleyshaw]

Overview

Migrate skills/design-md-agent/design-md-generator/scripts/ci-design-md-check.sh from Bash to JavaScript with Jest test coverage.

Current Implementation

The script:

• Runs DESIGN.md validation via validate-design-md.sh
• Executes the design.md CLI lint command in JSON format
• Parses JSON results and creates a PR comment with summary and top findings
• Exits with error code if lint errors found

Requirements

• Create scripts/design-md-agent/ciDesignMdCheck.js equivalent
• Leverage the validateDesignMd module (see related issue)
• Parse JSON lint output and extract summary stats
• Generate PR comment markdown with findings (limit to top 10)
• Jest tests with mocked design.md CLI outputs
• Handle both jq-available and non-available environments
• Proper error handling and exit codes
• Remove ci-design-md-check.sh after verification

Related

• Part of #[bash-to-js-migration-epic]
• Depends on: #[validate-design-md-issue]

[linear-code]

LS-801