diff --git a/.gitignore b/.gitignore
index 2868171..5280c86 100644
--- a/.gitignore
+++ b/.gitignore
@@ -17,3 +17,5 @@ htmlcov/
 # Local editor / tooling (not part of the SDK)
 .vscode/
 .claude/
+.idea
+.gitattributes
diff --git a/CODE_OF_CONDUCT.md b/CODE_OF_CONDUCT.md
new file mode 100644
index 0000000..9dc8954
--- /dev/null
+++ b/CODE_OF_CONDUCT.md
@@ -0,0 +1,15 @@
+# Code of Conduct
+
+This project adopts the [Contributor Covenant](https://www.contributor-covenant.org),
+version 2.1, as its code of conduct. The full text is available at:
+
+https://www.contributor-covenant.org/version/2/1/code_of_conduct/
+
+By participating in this project — contributing code, opening issues, or taking
+part in discussions — you agree to uphold this code of conduct.
+
+## Reporting
+
+To report unacceptable behavior, use GitHub's private reporting on this
+repository's **Security** tab, or contact the maintainers privately. All reports
+will be reviewed and handled confidentially.