[css-2025][selectors-4] Add Selectors 4 to Rough Interop

[SebastianZ]

Splitting the discussion from #9793 for adding Selectors 4 to the Modules with Rough Interoperability section of the CSS Snapshot 2025.

Data to consider:

Current status: WD (last published: 11 November 2022), ED from 28 August 2025
WPT: passing tests (all tests, not sure how to restrict to level 4): Chrome: 4934, Edge: 5550, Firefox: 5592, Safari: 4898; interop: 4808 / 5679 (84.7%), 5500 / 5679 (96.8%) for [Edge and Firefox](https://wpt.fyi/results/css/selectors?label=master&label=stable&aligned&q=edge%3Apass and firefox%3Apass)
Current Snapshot section: features :dir(), :lang(), and :focus-within in Safe to Release pre-CR Exceptions
Open issues: on GitHub: 128, in spec.: 8

Summary: High interoperability, very high interoperability between two engines, though many open issues. Though as not all features are supported by browsers, maybe only the interoperable ones should be added to Safe to Release pre-CR Exceptions.

Sebastian

[SebastianZ]

I obviously missed that it is already in the Snapshot as per resolution.

Sebastian