docs(labels): add reverted label for force-pushed PRs

Add label to mark PRs that were merged but later reverted from the
codebase via force push or reset.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: sjnims

.github/LABELS.md

@@ -49,6 +49,7 @@ Time estimates:
 **Special**:
 - `experiment` - Testing/experimental changes
 - `pinned` - Never mark as stale
+- `reverted` - Merged but later reverted from codebase
 - `security` - Security-related issues
 - `stale` - No recent activity (auto-applied by stale workflow)
 

.github/labels.yml

@@ -142,6 +142,10 @@
   color: "ededed"
   description: "No recent activity - will be closed soon"
 
+- name: "reverted"
+  color: "666666"
+  description: "Merged but later reverted from codebase"
+
 # Category labels (type of change)
 - name: "breaking"
   color: "bd2130"