Marketing agents are missing agent headers

[h4x0r]

Some agents .md files in the marketing folder is missing the agent headers, making them unusable in (at least) Claude Code.

To test it, either 1. check those .md files in the marketing folder, or 2. in Claude Code do /doctor, you should see:

...
   └ /Users/XXX/.claude/agents/marketing/instagram-curator.md: Missing required "name" field in frontmatter
   └ /Users/XXX/.claude/agents/marketing/twitter-engager.md: Missing required "name" field in frontmatter
   └ /Users/XXX/.claude/agents/marketing/growth-hacker.md: Missing required "name" field in frontmatter
   └ /Users/XXX/.claude/agents/marketing/content-creator.md: Missing required "name" field in frontmatter
   └ /Users/XXX/.claude/agents/marketing/reddit-community-builder.md: Missing required "name" field in frontmatter