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/info.go

@@ -16,10 +16,10 @@ func debugf(format string, args ...any) {
 
 // SystemInfo holds system resource usage information.
 type SystemInfo struct {
-	TotalMemMB  uint64  `json:"total_mem_mb"`
-	UsedMemMB   uint64  `json:"used_mem_mb"`
-	AvailMemMB  uint64  `json:"avail_mem_mb"`
-	MemPercent  float64 `json:"mem_percent"`
+	TotalMemMB uint64  `json:"total_mem_mb"`
+	UsedMemMB  uint64  `json:"used_mem_mb"`
+	AvailMemMB uint64  `json:"avail_mem_mb"`
+	MemPercent float64 `json:"mem_percent"`
 
 	DiskTotalGB float64 `json:"disk_total_gb"`
 	DiskUsedGB  float64 `json:"disk_used_gb"`