Fix YAML format - use comma-separated strings for aliases and related

- Convert aliases from YAML array to comma-separated string format
- Convert related topics from YAML array to comma-separated string format
- Match format used by existing topics (e.g., Python topic)
- Resolves test parsing issues expecting comma-separated values

Author: bdmorin

topics/claude-code/index.md

@@ -1,9 +1,9 @@
 ---
-aliases: [claude-cli, anthropic-claude-code, claude-code-cli, ai-terminal, intelligent-cli]
+aliases: claude-cli, anthropic-claude-code, claude-code-cli, ai-terminal, intelligent-cli
 created_by: Anthropic
 display_name: Claude Code
 github_url: https://github.com/anthropics/claude-code
-related: [ai, cli, terminal, developer-experience, automation]
+related: ai, cli, terminal, developer-experience, automation
 released: May 22, 2025
 short_description: "Claude Code is the foundational command-line interface that brings AI assistance to software development."
 topic: claude-code