Reported by bwgabrielsusai on #24719: granting a user only
`workspace.skills` doesn't show the Workspace menu, and visiting
`/workspace` directly bounces them to `/`.
The per-route guard in `/workspace/+layout.svelte` already covered
skills, but two earlier gates in the chain didn't:
* `Sidebar.svelte` case 'workspace' OR'd models/knowledge/prompts/tools
to decide menu visibility — skills was missing, so the entry never
rendered for skills-only users.
* `/workspace/+page.svelte` redirect chain picked the first available
section — skills was missing, so the fallback `goto('/')` fired.
Adding skills to both.
Classic298
359590ca9d