chore: add repo meta files (LICENSE, README, CHANGELOG, gitignore)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.editorconfig

@@ -0,0 +1,18 @@
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_style = space
+indent_size = 4
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.{yml,yaml,toml,json,md}]
+indent_size = 2
+
+[*.{kt,kts}]
+ij_kotlin_packages_to_use_import_on_demand = unset
+
+[Makefile]
+indent_style = tab