Expanded ignore list to ensure tool neutrality.

Author: RyanLamansky

.gitignore

@@ -6,3 +6,23 @@ obj/
 
 # Code coverage analysis results
 *.coverage
+
+# Don't want to be prescriptive about the user's development environment.
+.devcontainer/
+
+# The simplicity of this project structure enables AI tools to figure it out instantly.
+.claude/
+CLAUDE.md
+.codex/
+AGENTS.md
+.github/copilot-instructions.md
+.gemini/
+GEMINI.md
+.cursor/
+.cursorrules
+.aider*
+.windsurf/
+.windsurfrules
+
+# Suppress temporary files that might otherwise leak into a commit,
+tmp/