Creating Claude Rules

If you've been copying Cursor rules or just guessing at the format, you've probably hit errors. It shows the correct YAML structure, explains when to omit frontmatter entirely for global rules, and covers glob patterns for scoping rules to specific files. The side-by-side comparison table is helpful since most people are coming from Cursor. Also clarifies that `alwaysApply` doesn't exist in Claude's format. Useful when you're organizing project conventions into `.claude/rules/` and want to avoid trial and error with the syntax.