The desktop chat app's slash curation (desktop-slash-commands.ts) only
suggested the ~19 curated built-ins. isDesktopSlashSuggestion required
membership in DESKTOP_COMMANDS, so every skill-derived command and user
quick_command was silently dropped from both completion paths
(commands.catalog empty-query + complete.slash typed-query) and from
filterDesktopCommandsCatalog — even though isDesktopSlashCommand let them
EXECUTE when typed in full. The tui_gateway backend already includes skills
in both RPCs; the gap was purely renderer-side.
Add isDesktopSlashExtensionCommand() (= not-a-known-Hermes-built-in, the
same predicate that already gates execution) and let extensions through the
suggestion path. The catalog filter routes through isDesktopSlashSuggestion,
so skill/quick-command categories and pairs are kept automatically.
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