Add CI workflow and tighten build checks

Author: Codex

.github/workflows/ci.yml

@@ -0,0 +1,48 @@
+name: CI
+
+on:
+  push:
+    branches: ["**"]
+  pull_request:
+    branches: ["**"]
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  build:
+    name: Lint and Test
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, windows-latest]
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Install Rust
+        uses: dtolnay/rust-toolchain@stable
+
+      - name: Cache cargo registry and build
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/.cargo/bin/
+            ~/.cargo/registry/index/
+            ~/.cargo/registry/cache/
+            ~/.cargo/git/db/
+            target/
+          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-cargo-
+
+      - name: Cargo fmt
+        run: cargo fmt -- --check
+
+      - name: Cargo clippy
+        run: cargo clippy -- -D warnings
+
+      - name: Cargo test
+        run: cargo test

.gitignore

@@ -0,0 +1,9 @@
+target/
+**/*.pdb
+**/*.log
+/.idea/
+/.vscode/
+/.DS_Store
+*.exe
+*.dll
+