Complete automated testing

.github/workflows/shell-format.yml

@@ -0,0 +1,45 @@
+name: Shell Format & Lint
+
+on:
+  push:
+    branches: [main]
+    paths:
+      - '**/*.sh'
+      - mole
+  pull_request:
+    paths:
+      - '**/*.sh'
+      - mole
+
+jobs:
+  format-lint:
+    runs-on: macos-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Install shfmt and shellcheck
+        run: brew install shfmt shellcheck
+
+      - name: Run shfmt in diff mode
+        run: |
+          set -euo pipefail
+          mapfile -d '' files < <(find . -type f \( -name '*.sh' -o -name 'mole' \) \
+                                   ! -path './.git/*' ! -path './tests/tmp-*' -print0)
+          if (( ${#files[@]} == 0 )); then
+            echo "No shell files found; skipping shfmt"
+            exit 0
+          fi
+          shfmt -i 4 -ci -sr -d "${files[@]}"
+
+      - name: Run shellcheck
+        run: |
+          set -euo pipefail
+          mapfile -d '' files < <(find . -type f \( -name '*.sh' -o -name 'mole' \) \
+                                   ! -path './.git/*' ! -path './tests/tmp-*' -print0)
+          if (( ${#files[@]} == 0 )); then
+            echo "No shell files found; skipping shellcheck"
+            exit 0
+          fi
+          shellcheck --rcfile .shellcheckrc "${files[@]}"