fix: restore truncated PHP class tails (M1 fixup)

Bash-mount read truncated several PHP files at the last few lines;
Adding the missing method/class closers and returning braces.

Agent-Session: phase2-admin-m1-engineer

includes/core/class-cost-reporter.php

@@ -142,3 +142,5 @@ class PRAutoBlogger_Cost_Reporter {
 		}
 		return ( $this->get_monthly_spend() / $budget ) * 100.0;
 	}
+
+}