Update shell code

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

framework/shims/pnpm

@@ -2,11 +2,15 @@
 
 set -eu
 
-DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+pnpm_shim_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+export pnpm_shim_DIR
 
-source "$DIR"/node.common
-source "$DIR"/common
+# shellcheck source=./node.common
+source "$pnpm_shim_DIR"/node.common
 
-cd $ROOT/framework/node
+# shellcheck source=./common
+source "$pnpm_shim_DIR"/common
 
-exec "$DIR"/../binaries/pnpm "$@"
+# cd $ROOT/framework/node
+
+exec "$pnpm_shim_DIR"/../binaries/pnpm "$@"