test(demo): restructure issue #1370 regression tests to match maphash style

- Remove temporary .tmp-comment/ and .tmp-images/ directories
- Remove llgo binary from repository
- Refactor _demo/go/issue1370_case1 to include multiple test functions with proper validation
- Refactor _demo/go/issue1370_case2 to include multiple test functions with proper validation
- Tests now panic on failure with descriptive error messages
- Follow the same test structure as _demo/go/maphash

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

_demo/go/issue1370_case1/main.go

@@ -1,18 +1,58 @@
 package main
 
 import (
+	"fmt"
 	"go/types"
 )
 
 func main() {
+	testScopeInsertLookup()
+	testScopeLookupNonExistent()
+	testScopeMultipleObjects()
+}
+
+func testScopeInsertLookup() {
+	fmt.Println("=== Test Scope Insert and Lookup ===")
 	scope := types.NewScope(nil, 0, 0, "test")
 	obj := types.NewVar(0, nil, "x", types.Typ[types.Int])
 
 	scope.Insert(obj)
 
-	if scope.Lookup("x") == obj {
-		println("SUCCESS: Scope.Insert and Lookup work correctly")
-	} else {
-		println("FAIL: Lookup returned wrong object")
+	result := scope.Lookup("x")
+	if result != obj {
+		panic(fmt.Sprintf("Lookup returned wrong object: expected %v, got %v", obj, result))
 	}
+	fmt.Println("SUCCESS: Scope.Insert and Lookup work correctly")
+}
+
+func testScopeLookupNonExistent() {
+	fmt.Println("\n=== Test Scope Lookup Non-Existent ===")
+	scope := types.NewScope(nil, 0, 0, "test")
+	
+	result := scope.Lookup("nonexistent")
+	if result != nil {
+		panic(fmt.Sprintf("Lookup should return nil for non-existent name, got %v", result))
+	}
+	fmt.Println("SUCCESS: Lookup returns nil for non-existent name")
+}
+
+func testScopeMultipleObjects() {
+	fmt.Println("\n=== Test Scope Multiple Objects ===")
+	scope := types.NewScope(nil, 0, 0, "test")
+	obj1 := types.NewVar(0, nil, "x", types.Typ[types.Int])
+	obj2 := types.NewVar(0, nil, "y", types.Typ[types.String])
+
+	scope.Insert(obj1)
+	scope.Insert(obj2)
+
+	result1 := scope.Lookup("x")
+	if result1 != obj1 {
+		panic(fmt.Sprintf("Lookup('x') returned wrong object: expected %v, got %v", obj1, result1))
+	}
+
+	result2 := scope.Lookup("y")
+	if result2 != obj2 {
+		panic(fmt.Sprintf("Lookup('y') returned wrong object: expected %v, got %v", obj2, result2))
+	}
+	fmt.Println("SUCCESS: Multiple objects handled correctly")
 }