diff --git a/.codex/AGENTS.md b/.codex/AGENTS.md
new file mode 100644
index 0000000..aed226d
--- /dev/null
+++ b/.codex/AGENTS.md
@@ -0,0 +1,2 @@
+all readme files must be named `readme.md` (lowercase).
+after you finish work, commit with a conventional message. only commit the files you edited.
diff --git a/.gitignore b/.gitignore
index 76faa90..02ec5aa 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,3 @@
-.codex/
 *.sqlite
 *.sqlite3
 *.sqlite3-shm