chore: initialize monorepo with project scaffolding, configs, and CI setup

.editorconfig

@@ -0,0 +1,13 @@
+# Editor configuration for AITBC monorepo
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_style = space
+indent_size = 4
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.{py,js,ts,tsx,json,yaml,yml,md}]
+indent_size = 2