Add CI workflow.

.cargo/config.toml

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+[target.wasm32-wasip1]
+runner = "wasmtime run --dir ."

.github/workflows/ci.yml

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+---
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+env:
+  RUST_BACKTRACE: 1
+  ALL_FEATURES: suite_p256,suite_ristretto255
+
+jobs:
+  test:
+    name: Test
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+
+      - name: Install Rust (MSRV)
+        uses: dtolnay/rust-toolchain@1.88
+
+      - name: Check
+        run: cargo check --features ${{ env.ALL_FEATURES }}
+
+      - name: Build
+        run: cargo build --features ${{ env.ALL_FEATURES }}
+
+      - name: Test
+        run: cargo test --features ${{ env.ALL_FEATURES }}
+
+  lint:
+    name: Lint
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+
+      - name: Install Rust (stable)
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          components: clippy, rustfmt
+
+      - name: fmt
+        run: cargo fmt --check
+
+      - name: clippy
+        run: |
+          cargo clippy \
+            --features ${{ env.ALL_FEATURES }} --all-targets -- -D warnings
+
+  docs:
+    name: Docs
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+
+      - name: Install Rust (stable + nightly for docsrs)
+        uses: dtolnay/rust-toolchain@nightly
+
+      - name: Build docs (docsrs simulation)
+        env:
+          RUSTDOCFLAGS: "--cfg docsrs -D warnings"
+        run: cargo doc --features ${{ env.ALL_FEATURES }} --no-deps
+
+  wasm:
+    name: WASM compilation
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+
+      - name: Install Rust (stable + wasm)
+        uses: dtolnay/rust-toolchain@1.88
+        with:
+          toolchain: stable
+          target: wasm32-wasip1
+
+      - name: Install wasmtime
+        uses: mwilliamson/setup-wasmtime-action@v2
+        with:
+          wasmtime-version: "42.0.2"
+
+      - name: Run tests in WASM
+        run: |
+          cargo test \
+            --target wasm32-wasip1 --features ${{ env.ALL_FEATURES }}