feat(lk): support non-interactive terminals and default accept flag

[rektdeckard]

https://linear.app/livekit/issue/GRW-129/improve-accessibility-of-interactive-cli-commands-for-coding-agents-by

Adds a default command execution mode when the not running in an interactive terminal or when the --yes flag is explicitly passed that:

• Skips rendering any interactive prompts
• Accepts boolean choices by default
• Uses implied default values when relevant
• Fails otherwise

This makes some actions possible in CI and other non-interactive sessions that were not previously possible, and should make it easier for coding agents to make use of the CLI.

For example:

lk agent init --yes

Will get you a python agent initialized, with a sandbox, with no interactive prompting, provided you have a default project set, or only one project credential registered.

[real-danm]

looks like this is just a new flag, so lgtm.
if there are breaking functional changes i'm missing we'd need to make a minor version bump.

[rektdeckard]

There is some new functionality I didn't mention, which is that lk a deploy now behaves like lk a create if this is the first deployment (we're in an agent project but no livekit.toml or other specified config file exists. I'll bump and deploy.