Added CI

Author: iamkanishka

.github/workflows/ci.yml

@@ -0,0 +1,91 @@
+name: CI
+
+on:
+  push:
+    branches: [master]
+    tags: ["v*"]
+  pull_request:
+    branches: [master]
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+env:
+  GO_VERSION: "1.25.8"
+
+jobs:
+  # ── 1. Lint ────────────────────────────────────────────────────────────────
+  lint:
+    name: Lint
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-go@v5
+        with:
+          go-version: ${{ env.GO_VERSION }}
+          cache: true
+
+      - name: go vet
+        run: go vet ./...
+
+      - name: gofmt
+        run: |
+          fmt=$(gofmt -l .)
+          if [ -n "$fmt" ]; then
+            echo "Files need formatting:"
+            echo "$fmt"
+            exit 1
+          fi
+
+  # ── 2. Test matrix ────────────────────────────────────────────────────────
+  test:
+    name: Test (Go ${{ matrix.go }})
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        go: ["1.25.8"]
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-go@v5
+        with:
+          go-version: ${{ matrix.go }}
+          cache: true
+
+      - name: Download modules
+        run: go mod download
+
+      - name: Build
+        run: go build ./...
+
+      - name: Test with race detector
+        run: go test -race -count=1 -timeout=120s ./...
+
+      - name: Test with coverage
+        if: matrix.go == env.GO_VERSION
+        run: go test -coverprofile=coverage.out -covermode=atomic ./...
+
+      - name: Upload coverage
+        if: matrix.go == env.GO_VERSION
+        uses: codecov/codecov-action@v4
+        with:
+          file: coverage.out
+          fail_ci_if_error: false
+
+  # ── 3. Benchmarks (informational only) ───────────────────────────────────
+  bench:
+    name: Benchmarks
+    runs-on: ubuntu-latest
+    needs: test
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
+        with:
+          go-version: ${{ env.GO_VERSION }}
+          cache: true
+      - name: Run benchmarks
+        run: go test -bench=. -benchmem -run='^$' ./...