remove list-code-usages tool

[olimorris]

Description

The list_code_usages_tool stands out as being complex, verbose and not fitting in with how I want CodeCompanion to feel to users (switching and parsing of buffers). It also doesn't match the speed and precision of the grep_search tool. Removing it as part of a breaking change for v19.0.0.

Checklist

• I've read the contributing guidelines and have adhered to them in this PR
• I confirm that this PR has been majority created by me, and not AI (unless stated in the "AI Usage" section above)
• I've run make all to ensure docs are generated, tests pass and StyLua has formatted the code
• (optional) I've added test coverage for this fix/feature
• (optional) I've updated the README and/or relevant docs pages

[olimorris]

Hi @lazymaniac and hope you're well.

I wanted to give you the heads up that for v19.0.0, I'm going to be removing the list_code_usages tool from CodeCompanion.

Moving forward, I want to keep the features that CodeCompanion provides to a core minimum, leaning heavily into the extensions API that we have. The tool itself is fantastic and I've enjoyed using it, however it's complex and worthy of being its own plugin that users can include.

Didn't want this to be seen as me not being thankful for your efforts and the hard yards you put in to get it over the line. I truly am appreciative of that.

[lazymaniac]

Hey, @olimorris no worries. You're the captain of the ship and I fully respect your decisions.