When all intersection elements fail a call, we now use a priority
hierarchy to determine which errors to show:
1. NotCallable (lowest) - object has no __call__ method
2. TopCallable - object is a top callable with unknown signature
3. BindingError (highest) - specific errors like invalid-argument-type
Only errors from the highest priority category are shown. This prevents
noise from less-specific errors when more informative errors are available.
For example, if an intersection has one element that fails with
invalid-argument-type and another that's not callable, we only show
the invalid-argument-type error since it's more specific and actionable.
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