Add git revert instructions

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

how-to-revert-git

@@ -0,0 +1,11 @@
+  Tag before major changes:
+git tag -a backup-before-networkframework -m "Known good state using MPC"
+
+  If you need to revert later:
+git reset --hard backup-before-networkframework
+
+  List tags with their messages:
+git tag -n
+
+git tag -n
+  ⎿  backup-before-networkframework Known good state using MPC