Over medium heat, combine corn stock and hominy in a large stockpot. Bring to a boil, reduce heat, and simmer for about 30 minutes, until hominy is al dente. (Note that cooking time may vary depending on the source and age of your hominy.) Add remaining ingredients—squash, red chile, and sage— and cook at a simmer until squash is tender, about 25 minutes. Slowly stir in the masa flour/water mixture and continue simmering until thickened. Season, to taste, with maple syrup and salt. Garnish with roasted squash seeds and fried sage.