Windows doing bullshit as always again. After running pnpm start in ./community-adder-template and confirming the community adder warning, it failed creating the symbolic link:

PS D:\dev\web\svelte-cli\community-adder-template> pnpm start

> community-adder-template@0.0.0 start D:\dev\web\svelte-cli\community-adder-template
> sv add -C temp --community file:../

┌  Welcome to the Svelte CLI! (v0.5.0)
│
◇  Resolved community adder packages
│
▲  The Svelte maintainers have not reviewed community adders for malicious code. Use at your discretion.
│
│  community-adder-template (v0.0.0) (D:\dev\web\svelte-cli\community-adder-template)
│
◇  Would you like to continue?
│  Yes
│
■  Failed to resolve community adder packages
└  Operation failed.

EPERM: operation not permitted, symlink 'D:\dev\web\svelte-cli\community-adder-template' -> 'D:\dev\web\svelte-cli\packages\cli\node_modules\community-adder-template'

Running exactly the same command from an administrator prompt fixes the issue.