Writing Hookify Rules

This teaches Claude how to write Hookify rules, which are markdown files with YAML frontmatter that let you define patterns to watch for during development and trigger messages when they match. The rules live in `.claude/hookify.{rule-name}.local.md` files and can hook into different events like bash commands, file changes, or prompts using regex patterns. It's useful if you want Claude to automatically catch specific coding patterns or workflows without manually reminding it each time. The skill comes from Anthropic's official claude-code repo and has passed multiple security audits. Think of it as setting up custom linting rules, but for AI behavior instead of code style.