chore(ci): enforce clippy -D warnings, add v2 branch trigger

.github/workflows/ci.yml

@@ -2,9 +2,9 @@ name: CI
 
 on:
   push:
-    branches: [main, master]
+    branches: [main, master, v2]
   pull_request:
-    branches: [main, master]
+    branches: [main, master, v2]
 
 env:
   CARGO_TERM_COLOR: always
@@ -45,7 +45,7 @@ jobs:
         run: cargo test --workspace
 
       - name: Clippy
-        run: cargo clippy --workspace --all-targets --
+        run: cargo clippy --workspace --all-targets -- -D warnings
 
   deny:
     name: cargo-deny
@@ -102,8 +102,6 @@ jobs:
       - name: Run coverage
         run: |
           cargo tarpaulin --workspace \
-            --exclude quicproquo-gui \
-            --exclude quicproquo-mobile \
             --exclude quicproquo-p2p \
             --out xml \
             --output-dir coverage/ \