diff --git a/.gitignore b/.gitignore
index 4a54c103..299dff75 100644
--- a/.gitignore
+++ b/.gitignore
@@ -51,3 +51,8 @@ __pycache__/
 # never checked in (was committed at 90be04bd; untracked here, LAN-only
 # exposure so no history scrub, just stop tracking it) ---
 .wolf/dashboard-token
+
+# --- session checkpoint 2026-08-24: capnp-c codegen output, regenerated
+# from src/schema/controller.capnp by the build -- never checked in ---
+src/lib/controller.capnp.c
+src/lib/controller.capnp.h