NO-JIRA: Add Claude Code command /check-best-practices

[krishagarwal278]

Summary

Add /check-best-practices slash command for analyzing code adherence to OpenShift Console style guide and best practices.

Changes

• Add .claude/commands/check-best-practices.md - references STYLEGUIDE.md and .ai/context.md as authoritative sources
• Update STYLEGUIDE.md - improve section headers, clarify React.FCC comment, add reference to .ai/context.md

Usage

/check-best-practices

Analyzes files against official coding standards and provides structured reports with compliance scores and recommendations.