Initial commit with .gitignore

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.gitignore

@@ -0,0 +1,21 @@
+# Editor and IDE files
+*.swp
+*.swo
+*~
+.vscode/
+.idea/
+
+# OS files
+.DS_Store
+Thumbs.db
+
+# Build artifacts
+*.o
+*.a
+*.so
+*.out
+
+# Environment and secrets
+.env
+*.key
+*.pem