docs(known issues): explain that mas relies on mds

[gforien]

No description provided.

[Copilot]

Pull Request Overview

This PR updates the README documentation to explain that starting with version 2.0, mas relies on macOS’ Metadata Server (mds) via Spotlight for associating app IDs with applications.

• Added a new section detailing why mas list might return no results.
• Provided concrete examples using mdls and mdfind commands to verify app IDs.

[rgoldberg]

@gforien I might either:

1. Output a warning to stderr detailing how to start/reset Spotlight indexing whenever mas list returns nothing
2. If the mas Swift code doesn't find apps, check if Spotlight indexing is on, then, if not, turn it on. But users might have intentionally disabled it, in which case it would be bad if I enabled it without asking. Currently, mas neither asks for input (besides an optional password prompt for the broken mas signin), nor stores settings (which could be used to remember if a user wants to always restart Spotlight indexing or not); adding such would require extra time & effort for research & implementation, so it probably makes sense to just do 1 (outputting Spotlight indexing instructions to stderr) for now.

Does 1 seem adequate to you for now?

[gforien]

Yes, a message on stderr seems reasonable in this case

[rgoldberg]

@gforien the changes are all in 2.2.1, which is available from a GitHub Release & the mas Homebrew custom tap.

It should be available from homebrew-core in a few minutes; it was just merged into master.

Thanks for the help.