diff --git a/.story_kit/work/4_merge/256_story_bot_must_verify_other_users_cross_signing_identity_before_checking_device_verification.md b/.story_kit/work/4_merge/256_story_bot_must_verify_other_users_cross_signing_identity_before_checking_device_verification.md
index abf00bb..584d94c 100644
--- a/.story_kit/work/4_merge/256_story_bot_must_verify_other_users_cross_signing_identity_before_checking_device_verification.md
+++ b/.story_kit/work/4_merge/256_story_bot_must_verify_other_users_cross_signing_identity_before_checking_device_verification.md
@@ -1,5 +1,6 @@
 ---
 name: "Bot must verify other users' cross-signing identity before checking device verification"
+merge_failure: "Squash-merge resulted in an empty diff — the feature branch has no code changes beyond master. The coder agent appears to not have committed any implementation work to the feature branch."
 ---
 
 # Story 256: Bot must verify other users' cross-signing identity before checking device verification