Add Verbose log level between Info and Debug

Implemented full log level hierarchy: Fatal, Error, Warn, Info, Verbose, Debug.
- Verbose level (-v) shows detailed operations like file changes (M/A/D)
- Debug level (-vv) shows low-level tracing with caller info
- Quiet mode (-q) sets level to Error, suppressing Info messages
- Banner and summary output now use log levels for filtering

internal/cli/check.go

@@ -140,14 +140,12 @@ func (mfa *CLIApp) checkManifestOperation(ctx *cli.Context) error {
 		<-extraDone
 	}
 
-	if !ctx.Bool("quiet") {
-		elapsed := time.Since(mfa.startupTime).Seconds()
-		rate := float64(chk.TotalBytes()) / elapsed / 1e6
-		if failures == 0 {
-			log.Infof("checked %d files (%.1f MB) in %.1fs (%.1f MB/s): all OK", chk.FileCount(), float64(chk.TotalBytes())/1e6, elapsed, rate)
-		} else {
-			log.Infof("checked %d files (%.1f MB) in %.1fs (%.1f MB/s): %d failed", chk.FileCount(), float64(chk.TotalBytes())/1e6, elapsed, rate, failures)
-		}
+	elapsed := time.Since(mfa.startupTime).Seconds()
+	rate := float64(chk.TotalBytes()) / elapsed / 1e6
+	if failures == 0 {
+		log.Infof("checked %d files (%.1f MB) in %.1fs (%.1f MB/s): all OK", chk.FileCount(), float64(chk.TotalBytes())/1e6, elapsed, rate)
+	} else {
+		log.Infof("checked %d files (%.1f MB) in %.1fs (%.1f MB/s): %d failed", chk.FileCount(), float64(chk.TotalBytes())/1e6, elapsed, rate, failures)
 	}
 
 	if failures > 0 {