Add explicit language selector in lk agent CLI

[dimasimonowich]

Hi,
At the moment, I'm working on a project that is orchestrated by the pnpm, so I have a package.json in all services.

However, the agent-related service is written in Python, so it has a pyproject.toml (uv) as well. However, when I try to run

lk agent create

or

lk agent deploy

it sees the package.json and assumes it's a Node.js service. Then failing since:

package @livekit/agents not found in any project files

If I simply delete/rename package.json, everything works fine. However, this isn't an option for me due to the existing project architecture.

The CLI does not provide an option to manually select the project type; instead, it defines it on its own.

livekit-cli/cmd/lk/agent.go

Lines 543 to 547 in c18eb7a

	projectType, err := agentfs.DetectProjectType(os.DirFS(workingDir))
	if err != nil {
	return fmt.Errorf("unable to determine agent language: %w, please navigate to a directory containing an agent written in a supported language", err)
	}
	fmt.Printf("Detected agent language [%s]\n", util.Accented(string(projectType)))

livekit-cli/pkg/agentfs/detect.go

Line 75 in c18eb7a

func DetectProjectType(dir fs.FS) (ProjectType, error) {

It would be very helpful if anyone could add at least --language flag to the deploy command with python or node options.

Thanks in advance!