Cook the Pasta: Bring a large pot of water to a rolling boil. Add a moderate amount of salt and the whole-wheat spaghetti. Cook according to package directions until al dente. Before draining, carefully reserve 1 cup of the starchy pasta water, then drain the pasta.
Build the Aromatic Base: While the pasta cooks, heat the extra virgin olive oil in a large, deep skillet over medium heat. Add the sliced garlic and cook for 60-90 seconds, stirring constantly, until fragrant and just beginning to turn golden.
Sauté the Peppers: Add the sliced red and yellow bell peppers to the skillet. Sauté for 5-6 minutes, tossing occasionally, until they are crisp-tender.
Bloom the Flavors: Stir in the rinsed capers, dried oregano, and red pepper flakes. Cook for 30 seconds until fragrant.
Unite the Elements: Add the drained tuna to the skillet, gently flaking it apart. Add the cooked pasta, frozen peas, lemon zest, and ½ cup of the reserved pasta water. Toss vigorously over medium heat for 2-3 minutes, until the peas are hot and a light sauce has formed.
Add the Finishing Touches: Remove the skillet from the heat. Stir in the fresh lemon juice, chopped parsley, and mint. Season with the ½ teaspoon of sea salt and freshly ground black pepper. Toss one final time, adding another splash of pasta water if needed to reach your desired consistency.
Serve: Divide the pasta among four bowls. Garnish each serving with 1 tablespoon of freshly grated Parmigiano-Reggiano cheese and serve immediately.