Add Krea2 fixed-seed eval log

docs/sxcp-eval-loop.md

@@ -36,6 +36,11 @@ Every three minutes it prints a structured request asking Codex to:
 
 Runtime logs are written under `.sxcp_eval/` and ignored by git.
 
+Durable fixed-seed findings that justify a guide rule, generator patch, or pose
+variant promotion are recorded in [`krea2-eval-log.json`](krea2-eval-log.json).
+Use runtime logs for scratch notes; use the JSON log only for evidence that
+should remain tied to a catalog variant.
+
 ## Optional Command Hook
 
 If you have a one-shot Codex command you want to run automatically, set: