docs: update markdownlint command in CLAUDE.md

Co-Authored-By: Claude Sonnet 4.5 (1M context) <noreply@anthropic.com>

Author: sjnims

CLAUDE.md

@@ -51,7 +51,10 @@ This repo has TWO `.claude-plugin/` directories:
 claude --plugin-dir plugins/plugin-dev
 
 # Lint markdown
-markdownlint '**/*.md' --ignore node_modules
+markdownlint-cli2 '**/*.md'
+
+# Format markdown
+prettier --write '**/*.md'
 
 # Lint shell scripts
 shellcheck plugins/plugin-dev/skills/*/scripts/*.sh