Oil a large bowl with nonstick cooking spray and set aside. In a separate large bowl, combine all ingredients: whole wheat flour, warm water, maple syrup, canola oil, active dry yeast, and kosher salt.
Mix with a wooden spoon or stiff silicone spatula until a rough dough forms, then finish incorporating any dry bits by squeezing the dough with your hand.
Scrape the dough into the oiled bowl, cover with plastic wrap, and set in a warm spot.
After 30 minutes, use a bowl scraper to fold the dough: scrape down one side, pull the dough up and stretch it over itself, and repeat on all 4 sides. The dough will feel very loose and sticky. Cover and return to the warm spot.
Repeat the fold sequence two more times at 30-minute intervals, for a total of 3 sets of folds.
After the final fold, cover and bulk proof in a warm spot for about 1 hour, until the dough has doubled.
Spray two 8 to 9 inch loaf pans with nonstick cooking spray. Divide the dough into 2 equal pieces (approximately 530g each).
Shape each piece: stretch gently into a rectangle, fold the far edge down to the center, rotate 180 degrees, and fold the other edge down to the center. Perform 2 thumb folds by wrapping the dough around the thumb of your left hand and sealing the edge with the heel of your right hand, moving from right to left. The first pass will not fully close the log; a second thumb fold seals it completely.
Place each loaf seam side down in a prepared pan. Cover loosely with plastic wrap and proof in a warm spot for 45 to 60 minutes, until the dough has risen above the rim of the pan in most places.
While the loaves proof, preheat the oven to 350°F conventional (no fan).
Gently brush the tops with a beaten egg, taking care not to deflate the dough.
Bake for 20 to 22 minutes, or until the internal temperature reads 205°F on an instant-read thermometer.
Turn the loaves out onto a wire rack and cool completely before slicing.