Refactor CLI into a modular src layout with a single entrypoint (main.rs), src/commands, and shared src/utils (with focused unit tests)

.github/workflows/ci.yml

@@ -0,0 +1,82 @@
+name: ci
+
+on:
+  push:
+    branches: ["main", "master"]
+  pull_request:
+    branches: ["main", "master"]
+
+concurrency:
+  group: ci-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  test:
+    name: test (${{ matrix.os }})
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest]
+    runs-on: ${{ matrix.os }}
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: dtolnay/rust-toolchain@stable
+        with:
+          components: rustfmt, clippy
+
+      - uses: Swatinem/rust-cache@v2
+        with:
+          cache-targets: "false"
+
+      - name: fmt
+        if: matrix.os == 'ubuntu-latest'
+        run: cargo fmt --all -- --check
+
+      - name: check
+        if: matrix.os == 'ubuntu-latest'
+        run: cargo check --all-targets --all-features
+
+      - name: clippy
+        if: matrix.os == 'ubuntu-latest'
+        run: cargo clippy --all-targets --all-features -- -D warnings
+
+      - name: test
+        run: cargo test
+
+      - name: test (all features)
+        if: matrix.os == 'ubuntu-latest'
+        run: cargo test --all-features
+
+      - name: doc
+        if: matrix.os == 'ubuntu-latest'
+        env:
+          RUSTDOCFLAGS: "-D warnings"
+        run: cargo doc --no-deps --all-features
+
+  audit:
+    name: audit
+    runs-on: ubuntu-latest
+    if: github.event_name == 'pull_request' || github.ref == 'refs/heads/main' || github.ref == 'refs/heads/master'
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: dtolnay/rust-toolchain@stable
+
+      - uses: Swatinem/rust-cache@v2
+        with:
+          cache-targets: "false"
+
+      - uses: taiki-e/install-action@v2
+        with:
+          tool: cargo-audit
+
+      - name: audit
+        run: cargo audit