hive-forge: lint stale-branches reports each branch's merge outcome

claude-plugins/plugins/base/skills/forge-triage/SKILL.md

@@ -30,7 +30,10 @@ dimension directly.
   neglected owner.
 - **Stale branches** - `hive-forge lint stale-branches --days <n>`
   finds remote branches with no recent commits (skips branches that are
-  heads of open PRs), useful for spotting abandoned work.
+  heads of open PRs) and reports each one's merge outcome (PR merged /
+  closed unmerged / no PR at all) — squash-merge ancestry can't tell
+  those apart, so don't delete a stale branch on the age alone; check
+  the verdict first.
 
 ## Using them as a sweep