Should log informational messages to stderr instead of stdout

[sumit-sahrawat]

I tried to use avante.nvim in neovim and configured it to use opencode acp as follows:

{
  "yetone/avante.nvim",
  opts = {
    provider = "opencode",
    acp_providers = {
      opencode = {
        command = "opencode",
        args = { "acp" },
      },
    },
  },
}

I end up getting the following warnings:

Warn  02:24:44 notify.warn Failed to parse JSON-RPC message: [opencode-lmstudio] LM Studio plugin initialized
Warn  02:24:44 notify.warn Failed to parse JSON-RPC message: [opencode-lmstudio] Loaded 2 models

The integration didn't work at all and I'm not sure if this is the root cause but it'll be good to fix this I think.

[krisvandecruys]

this also gives a cosmetic issue: when using opencode TUI the log messages are printed over the ui elements