chore(fmt): repo-wide gofmt -w sweep — close drift surfaced by ci-pipeline-cleanup Phase 4

Mechanical reformat. The new 'gofmt drift' CI step (added in
ci-pipeline-cleanup Phase 4, commit 0f205a8) surfaced 111 files
with accumulated gofmt drift across cmd/, internal/, and deploy/test/.

Each file's diff is gofmt-standard: whitespace adjustments, intra-
group import sorting (alphabetical by import path within blank-line-
separated groups), and struct-tag column alignment. No semantic
changes — verified via 'git diff --ignore-all-space' which shows only
the line-position deltas from import reordering.

The gate stays in place after this commit. Going forward it catches
gofmt drift at PR time.

cmd/agent/verify_test.go

@@ -114,9 +114,9 @@ func TestExtractTargetHostAndPort_InvalidJSON(t *testing.T) {
 
 func TestExtractTargetHostAndPort_AlternativeFieldNames(t *testing.T) {
 	tests := []struct {
-		name      string
-		config    map[string]interface{}
-		expected  string
+		name     string
+		config   map[string]interface{}
+		expected string
 	}{
 		{"host", map[string]interface{}{"host": "host1.com"}, "host1.com"},
 		{"hostname", map[string]interface{}{"hostname": "host2.com"}, "host2.com"},