add cargo as const in project config (#1583)

Author: reshmifrog

common/project/projectconfig.go

@@ -49,6 +49,7 @@ const (
 	Ruby
 	Conan
 	UV
+	Cargo
 	Apt
 	Apk
 )
@@ -83,6 +84,7 @@ var ProjectTypes = []string{
 	"ruby",
 	"conan",
 	"uv",
+	"cargo",
 	"apt",
 	"apk",
 }

common/project/projectconfig_test.go

@@ -19,6 +19,7 @@ func TestFromString(t *testing.T) {
 		{"ruby", Ruby},
 		{"conan", Conan},
 		{"uv", UV},
+		{"cargo", Cargo},
 	}
 
 	for _, testCase := range testCases {
@@ -32,3 +33,10 @@ func TestFromString(t *testing.T) {
 	result := FromString("InvalidProject")
 	assert.Equal(t, ProjectType(-1), result)
 }
+
+// TestCargoStringRoundTrip guards the enum/slice alignment: Cargo must stringify to "cargo"
+// and round-trip through FromString. A misaligned append would shift indices and break this.
+func TestCargoStringRoundTrip(t *testing.T) {
+	assert.Equal(t, "cargo", Cargo.String())
+	assert.Equal(t, Cargo, FromString(Cargo.String()))
+}