Add AGENTS and CLAUDE md files with ci verification command

Author: n-hallberg

AGENTS.md

@@ -0,0 +1,7 @@
+# Agent Notes
+
+Verify your changes with:
+
+```bash
+pnpm run ci
+```

CLAUDE.md

@@ -0,0 +1,7 @@
+# Agent Notes
+
+Verify your changes with:
+
+```bash
+pnpm run ci
+```