Add .wiki/ and wiki-draft/ to .gitignore

Added directories for internal documentation that should not be committed
to the repository. These folders can be used for draft documentation,
internal notes, and reference materials.

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

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

.gitignore

@@ -44,3 +44,7 @@ Thumbs.db
 
 # Logs
 *.log
+
+# Documentation (not for repo)
+.wiki/
+wiki-draft/