Initial curated RAGcore source from c16667f0c9397e2bfc8dd0255b114fba23c8d05e

.editorconfig

@@ -0,0 +1,15 @@
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+indent_style = space
+indent_size = 4
+
+[*.{yaml,yml,json,md,toml}]
+indent_size = 2
+
+[Makefile]
+indent_style = tab