fix(verify): arm64 stack save, adaptive canary and host gating

Assisted-by: GLM 5.3

verify/sigparse_test.go

@@ -143,7 +143,10 @@ func TestParamSize(t *testing.T) {
 		{"uint8", 1},
 		{"byte", 1},
 		{"bool", 1},
-		{"string", 8}, // unknown type defaults to 8
+		{"string", 16}, // ABI0 header: data pointer + length
+		{"complex64", 8},
+		{"complex128", 16},
+		{"error", 8}, // unknown type defaults to 8
 	}
 	for _, tt := range tests {
 		if got := paramSize(tt.typ); got != tt.want {