(new): tgfmt package

(fix): formatting helpers
(ci/cd): go checks
(tests): tgfmt coverage

.gitea/workflows/go-lint.yaml

@@ -1,6 +1,6 @@
 name: Golang lint
 run-name: Linting code
-on: [push]
+on: [push, pull_request]
 
 jobs:
   lint:
@@ -10,10 +10,19 @@ jobs:
         uses: actions/checkout@v6
 
       - name: Verify formatting
-        run: test -z "$(gofmt -l .)"
+        run: |
+          files="$(gofmt -l .)"
+          if [ -n "$files" ]; then
+            echo "These files are not gofmt-formatted:"
+            echo "$files"
+            exit 1
+          fi
 
       - name: Run go test
         run: go test ./...
 
+      - name: Run go vet
+        run: go vet ./...
+
       - name: Run golangci-lint
         run: golangci-lint run