feature: Allow setting session cwd programmatically

[danilevy1212]

I want to create a session rooted at the parent directory of my project. I have several interdependent repositories, and I run Claude Desktop from a workspace directory that contains all of them so Claude can read and write across repos. I'm moving to agentic.nvim to stay in the editor, but I can't find a way to set the session's CWD before or after creation.

The CWD is hardcoded in acp_client.lua:

function ACPClient:create_session(handlers, callback)
    local cwd = vim.fn.getcwd()
    self:_send_request("session/new", {
        cwd = cwd,
        mcpServers = {},
    }, function(result, err) ... end)
end

Ideally, cwd would be a parameter I can pass programmatically. The exact mechanics I'm not sure about — it could be a config option, an argument to Agentic.new_session, a property of agentic.ui.NewSessionOpts, or a new function. Anything that lets me set the session's CWD directly.

[arlopezg]

I ran into the same thought when hooking nvim to a sandboxed agent via SSH, and I managed to work around the issue by using sed:

require("agentic").setup({
  provider = "my-agent:ssh",

  acp_providers = {
    ["my-agent:ssh"] = {
      name = "my-agent (SSH)",
      command = "ssh",
      args = {
        "-T",
        "foo@bar",
        "sed -u -E 's/\"cwd\"[[:space:]]*:[[:space:]]*\"[^\"]*\"/\"cwd\":\"\\/home\\/workspace\"/g' | my-agent --acp",
      },
    },
  },
})

It rewrites the current cwd to /home/workspace, which in my case is where I mount the current project for the agent to see. Hacky, but it gets the job done.