Add verbose flag for debug output control

Introduces log.Debug() function that respects a Verbose config flag, replacing direct [debug] fmt.Fprintf calls throughout the codebase. This allows debug logging to be toggled via -v/--verbose CLI flag.

pkg/log/log.go

@@ -11,6 +11,16 @@ import (
 // -----------------------------------------
 
 var logFile *os.File
+var Verbose bool
+
+// -----------------------------------------
+
+func Debug(format string, args ...interface{}) {
+	if !Verbose {
+		return
+	}
+	fmt.Fprintf(os.Stderr, "[debug] "+format+"\n", args...)
+}
 
 // -----------------------------------------