fix: remove --registry from npm install to avoid 404 on transitive deps

The @mosaic scope registry is configured in ~/.npmrc. Passing --registry
on the install command overrides the default registry for ALL packages,
causing non-@mosaic deps like @clack/prompts to 404 against Gitea.

tools/install.sh

@@ -189,8 +189,10 @@ else
   exit 0
 fi
 
+# NOTE: Do NOT pass --registry here. The @mosaic scope is already mapped
+# in ~/.npmrc. Passing --registry globally would redirect ALL deps (including
+# @clack/prompts, commander, etc.) to the Gitea registry, causing 404s.
 npm install -g "${CLI_PKG}@${LATEST}" \
-  --registry="$REGISTRY" \
   --prefix="$PREFIX" \
   2>&1 | sed 's/^/  /'