Update shell code

Now it (mostly) passes shellcheck and is formatted with shfmt.

framework/shims/node.common

@@ -1,4 +1,7 @@
-node_common_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+# Fix for https://www.shellcheck.net/wiki/SC2148
+# shellcheck shell=bash
+
+node_common_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 
 # FIXME this shouldn't be hardcoded here of course
 nodejs_binary_dir="$node_common_DIR/../binaries/node-v22.15.1-linux-x64/bin"
@@ -6,7 +9,6 @@ nodejs_binary_dir="$node_common_DIR/../binaries/node-v22.15.1-linux-x64/bin"
 # This might be too restrictive.  Or not restrictive enough.
 PATH="$nodejs_binary_dir":/bin:/usr/bin
 
-
 project_root="$node_common_DIR/../.."
 
 node_dir="$project_root/$nodejs_binary_dir"