build(cli): add tsconfig and typescript dev dep for type-checking

The cli package had no tsconfig, so it was never type-checked under its own
config. Add a tsconfig (matching the other packages, minus JSX which cli does
not use) and the typescript dev dep so `tsc --noEmit` can run here — a
prerequisite for the upcoming check:type script.

pnpm-lock.yaml

@@ -158,6 +158,9 @@ importers:
       '@types/node':
         specifier: 'catalog:'
         version: 24.12.4
+      typescript:
+        specifier: ^6.0.3
+        version: 6.0.3
       vite-plus:
         specifier: 'catalog:'
         version: 0.1.22(@types/node@24.12.4)(@voidzero-dev/vite-plus-core@0.1.22(@types/node@24.12.4)(esbuild@0.28.0)(tsx@4.22.3)(typescript@6.0.3))(esbuild@0.28.0)(tsx@4.22.3)(typescript@6.0.3)