Add follow-up issue guidance

files/agent-handoff.md

@@ -2,6 +2,8 @@
 
 Use this file when a task spans multiple sessions, has unresolved follow-up work, or changes release behavior.
 
+Prefer focused tracker issues for independent follow-up work when an issue tracker is available. Use this handoff file when issues cannot be created, when the context is too sensitive for a public issue, or when a task needs a compact session summary.
+
 ## Current State
 
 ```text
@@ -29,7 +31,12 @@ PENDING
 
 - PENDING
 
+## Follow-up Issues
+
+| Issue | Status |
+| --- | --- |
+| PENDING | PENDING |
+
 ## Risks
 
 - PENDING
-