chore: add copyright headers, CI tests, and sanitize gitignore

.github/workflows/test.yml

@@ -0,0 +1,31 @@
+name: Go Tests
+
+on:
+  push:
+    branches: [ "main", "master" ]
+  pull_request:
+    branches: [ "main", "master" ]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: '1.25.0'
+          cache: true
+          
+      - name: Build
+        run: go build -v ./...
+        
+      - name: Test
+        run: go test -v ./...
+        
+      - name: Vet & Lint
+        run: |
+          go vet ./...
+          go install honnef.co/go/tools/cmd/staticcheck@latest
+          staticcheck ./...