Add CI pipeline for format, clippy, and test

.config/nextest.toml

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+[profile.ci]
+junit = { path = "junit.xml" }

.github/workflows/ci.yml

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+name: CI
+
+on:
+  pull_request:
+    branches:
+      - main
+  push:
+    branches:
+      - main
+  workflow_dispatch:
+
+permissions:
+  actions: read
+  checks: write
+  contents: read
+  pull-requests: write
+
+concurrency:
+  group: ci-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  format:
+    name: Format
+    runs-on: ubuntu-24.04
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v6
+
+      - name: Install Rust toolchain
+        uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: "1.94"
+          components: rustfmt
+
+      - name: Check Rust formatting
+        id: rust_fmt
+        run: cargo fmt --all -- --check
+
+      - name: Write summary
+        if: always()
+        run: |
+          {
+            echo "## Flow Format Summary"
+            echo
+            echo "- Runner: \`ubuntu-24.04\`"
+            echo "- Rust formatting: \`${{ steps.rust_fmt.outcome }}\`"
+            echo "- Run URL: ${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY}/actions/runs/${GITHUB_RUN_ID}"
+          } >> "${GITHUB_STEP_SUMMARY}"
+
+  clippy:
+    name: Clippy
+    runs-on: ubuntu-24.04
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v6
+
+      - name: Install Rust toolchain
+        uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: "1.94"
+          components: clippy
+
+      - name: Cache Rust
+        uses: swatinem/rust-cache@v2
+
+      - name: Run Clippy
+        id: rust_clippy
+        run: cargo clippy --workspace --all-targets -- -D warnings
+
+      - name: Write summary
+        if: always()
+        run: |
+          {
+            echo "## Flow Clippy Summary"
+            echo
+            echo "- Runner: \`ubuntu-24.04\`"
+            echo "- Clippy: \`${{ steps.rust_clippy.outcome }}\`"
+            echo "- Run URL: ${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY}/actions/runs/${GITHUB_RUN_ID}"
+          } >> "${GITHUB_STEP_SUMMARY}"
+
+  test:
+    name: Test
+    runs-on: ubuntu-24.04
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v6
+
+      - name: Install Rust toolchain
+        uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: "1.94"
+
+      - name: Cache Rust
+        uses: swatinem/rust-cache@v2
+
+      - name: Install cargo-nextest
+        uses: taiki-e/install-action@nextest
+
+      - name: Run tests with JUnit output
+        id: rust_tests
+        run: cargo nextest run --workspace --profile ci
+
+      - name: Upload test artefacts
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: test-results
+          path: target/nextest/ci/junit.xml
+          if-no-files-found: warn
+
+      - name: Publish unit test results
+        if: always()
+        uses: EnricoMi/publish-unit-test-result-action@v2
+        with:
+          check_name: Flow Tests
+          files: target/nextest/ci/junit.xml
+
+      - name: Write summary
+        if: always()
+        run: |
+          {
+            echo "## Flow Test Summary"
+            echo
+            echo "- Runner: \`ubuntu-24.04\`"
+            echo "- Tests: \`${{ steps.rust_tests.outcome }}\`"
+            echo "- Test artefact: \`target/nextest/ci/junit.xml\`"
+            echo "- Run URL: ${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY}/actions/runs/${GITHUB_RUN_ID}"
+          } >> "${GITHUB_STEP_SUMMARY}"
+
+  report-pr-results:
+    name: PR summary
+    if: github.event_name == 'pull_request' && !github.event.pull_request.head.repo.fork
+    needs:
+      - format
+      - clippy
+      - test
+    runs-on: ubuntu-latest
+    steps:
+      - name: Post CI summary comment
+        uses: actions/github-script@v7
+        with:
+          script: |
+            const marker = '<!-- ci-check-summary -->';
+            const label = (result) =>
+              result === 'success' ? '[PASS]' :
+              result === 'failure' ? '[FAIL]' : '[SKIP]';
+
+            const fmt    = '${{ needs.format.result }}';
+            const clippy = '${{ needs.clippy.result }}';
+            const tests  = '${{ needs.test.result }}';
+
+            const body = [
+              marker,
+              '## CI check summary',
+              '',
+              `- ${label(fmt)} Format: \`${fmt}\``,
+              `- ${label(clippy)} Clippy: \`${clippy}\``,
+              `- ${label(tests)} Test: \`${tests}\``,
+            ].join('\n');
+
+            const issue_number = context.issue.number;
+            const { data: comments } = await github.rest.issues.listComments({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number,
+              per_page: 100,
+            });
+
+            const existing = comments.find((c) =>
+              c.user?.type === 'Bot' && c.body?.includes(marker)
+            );
+
+            if (existing) {
+              await github.rest.issues.updateComment({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                comment_id: existing.id,
+                body,
+              });
+            } else {
+              await github.rest.issues.createComment({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                issue_number,
+                body,
+              });
+            }

.node-version

@@ -0,0 +1 @@
+24