style: gofmt normalization — no logic changes

gofmt -w across the controller tree (46 files) so gofmt -l is empty — disarms the
formatting landmine where a targeted edit + accidental gofmt -w swept ~46 unrelated
files. Pure formatting: whitespace + gofmt's optional-semicolon removal in reflowed
inline closures. One doc comment reworded ('' -> 'the empty string') to avoid gofmt's
Go-1.19 doc-comment typographic substitition ('' -> curly quote) muddying its meaning.
No build/vet/test behavior change.

controller/internal/system/mounts_linux.go

@@ -276,7 +276,7 @@ func diskModel(device string) string {
 type ProbeStatus int
 
 const (
-	ProbeConnected    ProbeStatus = iota
+	ProbeConnected ProbeStatus = iota
 	ProbeDisconnected
 	ProbeTimeout
 )