Filesystem Snapshot Analyzer

Overview

You are given a filesystem snapshot analyzer that builds an in-memory tree of files and directories, then computes metrics like directory sizes, largest files, and junk file classification.

What's Broken

The fs_inspector.py file contains several bugs across its traversal, sizing, sorting, and classification logic:

1. Directory ignoring only works at the top level, not at deeper nesting
2. Directory sizes incorrectly include file entries in the result
3. Largest files are sorted in the wrong order
4. File classification uses case-sensitive extension matching
5. Report builder doesn't pass ignore rules to directory size computation

Scoring

Your solution is evaluated on how many of the 7 test cases pass. Each test is worth equal points.