diff --git a/TODO b/TODO
index 12b64a3..ecdb34d 100644
--- a/TODO
+++ b/TODO
@@ -172,3 +172,22 @@ Description: The trainer is nearly silent: outside an example count and a save
              when any are dropped), and raise transformers' verbosity during
              training so the per-step curve shows. Apply to train() and
              inspect().
+
+--ISSUE
+Content-Type: application/issue
+ID: 11
+Type: bugfix
+Title: operate_rate can sum a None (eval + resident)
+Status: open
+Priority: medium
+Created: 2026-06-17
+Module: sekft
+Relationships: 
+Description: operate_rate computes sum(t.steps > 0 and t.meta.get('clean') for t
+             in rows). The 'and' yields the right operand when steps>0, so if
+             meta lacks the 'clean' key it yields None and sum() raises
+             TypeError at runtime; mypy (now that posix-sdc ships py.typed and
+             Trajectory is typed) flags the generator item type in eval.py:83
+             and resident.py:157. Wrap the predicate in bool() so it counts
+             trajectories that operated and are clean, fixing both the type
+             error and the latent crash.