tests: update test cases for newer syntax items; drop old artifacts

Signed-off-by: NotAShelf <raf@notashelf.dev>
Change-Id: I8640148e8e7597924f9c776750c856266a6a6964

tests/select_or_default.nix

@@ -0,0 +1,16 @@
+# Test selection with 'or' default
+let
+  attrs = { a = 1; b = 2; };
+in {
+  # Attribute exists - should use value from attrs
+  has_attr = attrs.a or 999;
+
+  # Attribute doesn't exist - should use default
+  missing_attr = attrs.c or 100;
+
+  # Nested default expression
+  nested = attrs.d or (attrs.a + attrs.b);
+
+  # Default with literal
+  with_string = attrs.name or "default_name";
+}