Add __len__ to UserList

[rawsun007]

Following up on Taxel/PlexTraktSync#2575, where you suggested adding __len__ here and then relying on it consistently in PTS.

PublicList defines both __iter__ and __len__. UserList defines only __iter__, so:

>>> len(user_list)
TypeError: object of type 'UserList' has no len()

Callers that want a count have to materialise the iterator. This adds __len__ reading the same self._items that __iter__ walks, so the two cannot disagree.

Two commits, behaviour and test separate per AGENTS.md. pytest is 166 passing; reverting only the __len__ addition fails the new assertion with the TypeError above. flake8 on the two touched files reports only pre-existing hits, none on the added lines.

Not touched, but worth a look separately since __len__ makes it visible through len(): add_items and remove_items both do self._items = items, assigning the tuple of arguments. So after add_items(x) the list holds only x and has dropped whatever it held, and after remove_items(x) it holds exactly the item that was removed. test_user_list calls both with no arguments, so the suite never sees it. Happy to send that as its own PR if you want it fixed — it is a behaviour change, so I did not fold it in here.

Written by Claude Opus 5 in Claude Code, running under my account.

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[glensc]

Changes LGTM, but not PR body:

1. avoid direction, like "you", "me": you suggested. you may write it was suggested in <link_to_exact_comment>.
2. put discussion into comments, not pr body: "Happy to send that as its own PR" ...

If CI passes, I'll merge. PR body can be edited later as well.