1. Rinse lemon; trim and discard thin slices from each end. Thinly slice lemon, saving the juice; discard seeds and finely chop fruit. Put fruit and juice in a 5- to 6-quart pan. Add coriander seeds, fennel seeds, pepper, broth, and wine. Bring to a boil over high heat. Add pasta, stir, then add shrimp; stir often until pasta is tender to bite and shrimp are opaque but still moist-looking in center of thickest part (cut to test), about 5 minutes.
2. Add chives. Using two forks, lift pasta mixture to mix, then transfer equally to wide bowls, adding any remaining broth. Garnish with lemon wedges to squeeze over portions; add salt to taste.