Add coverage CI workflow

.github/workflows/coverage.yml

@@ -0,0 +1,55 @@
+name: Coverage
+
+on:
+  push:
+  pull_request:
+
+env:
+  CARGO_TERM_COLOR: always
+
+permissions:
+  contents: read
+
+jobs:
+  coverage:
+    name: Coverage Report
+    runs-on: ubuntu-latest
+
+    steps:
+      - id: checkout
+        name: Checkout Repository
+        uses: actions/checkout@v4
+
+      - id: setup
+        name: Setup Toolchain
+        uses: dtolnay/rust-toolchain@stable
+
+      - id: cache
+        name: Enable Workflow Cache
+        uses: Swatinem/rust-cache@v2
+
+      - id: install-llvm-cov
+        name: Install cargo-llvm-cov
+        uses: taiki-e/install-action@v2
+        with:
+          tool: cargo-llvm-cov
+
+      - id: coverage-text
+        name: Generate Text Coverage Summary
+        env:
+          SKIP_AI_ENFORCEMENT: 1
+        run: cargo cov
+
+      - id: coverage-html
+        name: Generate HTML Coverage Report
+        env:
+          SKIP_AI_ENFORCEMENT: 1
+        run: cargo cov-html
+
+      - id: upload-coverage
+        name: Upload HTML Coverage Report
+        uses: actions/upload-artifact@v4
+        with:
+          name: coverage-html-report
+          path: target/llvm-cov/html/
+          retention-days: 30