feat(snippets): minor tweaks

Author: david-hamilton-glean

packages/nvim/snippets/all.snippets

@@ -152,6 +152,9 @@ snippet @timebox
 snippet @depends-on
 	🔗${0}
 
+snippet @bug
+  🐞${0}
+
 snippet @done
 	✅${0}
 
@@ -209,6 +212,9 @@ snippet @maintenance
 snippet @milestone
 	🚩${0}
 
+snippet @checkpoint
+	🚩${0}
+
 snippet @roadmap
 	🛣️${0}