Add opencode setup instructions

[carnage]

A quick docs update to show an example configuration for opencode.

Other AI harnesses are probably similar enough users can work it out from the example given.

Implements #208

[calebdw]

I'm not sure that I really care to show specific examples, if anything a sentence or two pointing telling users to look at the docs for their specific harness should suffice---these are developers we're targetting...

I'll leave up to @AJenbo

[AJenbo]

A lot of people are asking for how to do this, we could maybe split things up in a editor and how to do so for agentic coding tools.

Other AI harnesses are probably similar enough users can work it out from the example given.

They could have just asked there tool, but I think a lot of times these guides also work as a "Is supported" list which is often what people are actually looking for.

[AJenbo]

@carnage have you had a good experience using PHPantom with your AI?

[carnage]

@carnage have you had a good experience using PHPantom with your AI?

I came here looking for instructions on how to configure, found the old issue asking about it. Figured it out myself and contributed back (was non-trivial as I'd originally attempted to set it up to use the analyse command rather than --stdio). Only been using it with the agent for a few test edits so far but it seems to be doing well; outside of an initial lag on the first edit. (which I assume was it indexing the project)

[AJenbo]

Thanks, I appreciate the feedback.

[AJenbo]

I split it up into a IDE and Agent section now that we also have a Claude Code plugin:

https://github.com/PHPantom-dev/phpantom_lsp/blob/main/docs/SETUP.md#agent-setup

@carnage I don't know much about OpenCode but maybe a similar option would make sens for it? https://github.com/PHPantom-dev/phpantom_claude#install

It handles both downloading the latest binder and besides the LSP side of things it also adds a skill file that lets the agent know how to use the CLI options to analyze a full project and apply auto fixes.

[carnage]

Opencode does allow for plugins as well but I've not really explored them or writing my own as of yet.

I currently only use local models so I've been working on ways to get the model to produce correct output despite not being as powerful as the hosted/paid options.