Exclude .claude/ from version control

Add .claude/ to .gitignore and remove previously tracked settings.local.json.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: mycollablab

.claude/settings.local.json

@@ -20,3 +20,6 @@ api_reference.md
 .vscode/
 *.swp
 *.swo
+
+# Claude Code
+.claude/