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 71b2245) 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/agent_test.go

@@ -692,10 +692,10 @@ func TestMakeRequest_InvalidURL(t *testing.T) {
 // TestCertKeyInfo tests extraction of key algorithm and size from certificates.
 func TestCertKeyInfo(t *testing.T) {
 	tests := []struct {
-		name         string
-		genKey       func() interface{}
-		expectedAlg  string
-		minBitSize   int
+		name        string
+		genKey      func() interface{}
+		expectedAlg string
+		minBitSize  int
 	}{
 		{
 			name: "ECDSA P-256",
@@ -1503,9 +1503,9 @@ func TestValidateHTTPSScheme(t *testing.T) {
 			wantErrSub: "plaintext http://",
 		},
 		{
-			name:       "bare host missing scheme falls through to unsupported",
-			serverURL:  "localhost:8443",
-			wantErr:    true,
+			name:      "bare host missing scheme falls through to unsupported",
+			serverURL: "localhost:8443",
+			wantErr:   true,
 			// url.Parse treats "localhost:8443" as scheme=localhost,
 			// opaque=8443 — exercises the default arm (unsupported scheme)
 			// rather than the empty-scheme arm. Both are fail-closed, which