fix(ascleandict): recurse to clean the dict

[MrKevinWeiss]

It seems like some deeply nested cases do not get caught. This should make sure we get rid of every empty object, even if the object become empty after a pass.

[Copilot]

Pull request overview

This PR fixes the ascleandict function to properly handle deeply nested empty structures by adding recursive cleaning logic. Previously, nested objects that became empty after their contents were cleaned were not removed, leading to incomplete cleanup.

Key Changes:

• Added a new clean_value helper function that recursively processes dictionaries and lists
• Implemented a while loop to handle cascading cleanup where removing empty values causes parent structures to become empty
• Enhanced test coverage with new test cases for deeply nested structures and list cleaning

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 5 comments.

File	Description
src/lob_hlpr/hlpr.py	Implements recursive cleaning logic with clean_value function and cascading cleanup via while loop to remove empty nested structures
tests/test_lob_hlpr.py	Adds comprehensive test cases for deeply nested structure cleanup, including multi-level nesting and list element filtering

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