docs: add tip block for finding available models

[trillium]

Adds a tip to the agent configuration documentation, letting users know they can run opencode models to list all available models in their current setup.

I had this question and asked it in the discord here.

Thanks to user emre for help with this :)

[jayair]

Thanks! Btw, can we remove the changes to the STATS.md in this PR?

[trillium]

Definitely, sorry I didn't realize I included other changes.

…

On Fri, Sep 12, 2025 at 4:36 PM Jay ***@***.***> wrote: *jayair* left a comment (sst/opencode#2501) <#2501 (comment)> Thanks! Btw, can we remove the changes to the STATS.md in this PR? — Reply to this email directly, view it on GitHub <#2501 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABM76GN7NMLRO2MWQKOU2ND3SNKHPAVCNFSM6AAAAACF6W3TZKVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZTEOBXGEZTSNZZG4> . You are receiving this because you authored the thread.Message ID: ***@***.***>

[trillium]

@jayair It's looking like when I hit update branch those changes from the stats.md file are gone:

[jayair]

Thanks!