```python
def check_manifest(line: dict) -> dict:
    if not all(k in line for k in ('sku', 'count', 'note')):
        raise ValueError("Manifest must contain sku, count, and note keys.")
    
    sku = line.get('sku', '').strip()
    if not isinstance(sku, str) or not sku:
        raise ValueError("SKU must be a non-empty string.")
    
    count = line.get('count')
    if not isinstance(count, int) or count <= 0:
        raise ValueError("Count must be a positive whole number.")
    
    note = line.get('note', '')
    if not isinstance(note, str):
        raise ValueError("Note must be a string.")
    
    return {'sku': sku.upper(), 'count': count, 'note': note}
```