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**Summary** Replace conditional explicit import of partitioner modules in `.partition.auto` with the new `_PartitionerLoader` class. This avoids unbound variable warnings and is much less noisy. `_PartitionerLoader` makes use of the new `FileType` property `.importable_package_dependencies` to determine whether all required packages are importable before dispatching the file to its partitioner. It uses `FileType.extra_name` to form a helpful error message when a dependency is not installed, so the caller knows which `pip install` extra to specify to remedy the error. `PartitionerLoader` uses the `FileType` properties `.partitioner_module_qname` and `partitioner_function_name` to load the partitioner once its dependencies are verified. Loaded partitioners are cached with module lifetime scope for efficiency.