feat: migrate sl to lifo-pkg-sl package

[FrederickStempfle]

Summary

Moves the `sl` (steam locomotive) command out of core and into its own
`lifo-pkg-sl` package, following the same pattern as `lifo-pkg-git` and
`lifo-pkg-ffmpeg`.

• Removes `sl` from `@lifo-sh/core`'s command registry
• Creates `packages/lifo-pkg-sl` with its own build config and README
• Registers it in the playground alongside the other pkg commands
• Published to npm as `lifo-pkg-sl@0.5.1`

Users can now install it with `lifo install sl`.

[DaminiPandey]

@FrederickStempfle Thanks for the update. This looks great and follows the same pattern as lifo-pkg-git and lifo-pkg-ffmpeg, which is nice to see.

We noticed you’ve published it as lifo-pkg-sl@0.5.1. If you’d like us to keep it under the official Lifo packages, could you add us as an owner on npm? Without owner access, we won’t be able to properly manage or maintain it on our side.

Once that’s sorted, we’re happy to take it forward.

[FrederickStempfle]

@FrederickStempfle Thanks for the update. This looks great and follows the same pattern as lifo-pkg-git and lifo-pkg-ffmpeg, which is nice to see.

We noticed you’ve published it as lifo-pkg-sl@0.5.1. If you’d like us to keep it under the official Lifo packages, could you add us as an owner on npm? Without owner access, we won’t be able to properly manage or maintain it on our side.

Once that’s sorted, we’re happy to take it forward.

sure, send me all the npm usernames you want me to add to it.

[DaminiPandey]

You can add sanketsahu.

[FrederickStempfle]

You can add sanketsahu.

@DaminiPandey @sanketsahu i added him :)

[sanketsahu]

thanks! we will review and merge.

[FrederickStempfle]

sounds good 👍