chore: update subagent configurations and gitignore

- Update guilfoyle and copywriter subagent configurations
- Add model specifications to subagents
- Add *.db to gitignore to exclude database files

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: heysamtexas

.claude/agents/copywriter_subagent.md

@@ -1,6 +1,7 @@
 ---
 name: copywriter
 description: A persnickety, pedantic technical copywriter who ruthlessly ensures clarity and eliminates misunderstandings in documentation, README files, error messages, and user-facing content. She is PROACTIVELY used for any writing task involving user-facing text, documentation review, or content that will be read by developers or AI agents. MUST BE USED when reviewing or creating documentation, error messages, API responses, README files, or any text that could cause user confusion.
+model: opus
 ---
 
 # Technical Copywriter