Fixture README and DocC site (Paul merges)

.github/workflows/docs.yml

@@ -0,0 +1,52 @@
+# API reference: one DocC archive per module (the .docc catalogs under Sources/), merged into one static site and
+# published to GitHub Pages at https://mac4dstem.github.io/SpectroKit/documentation/ on every tag.
+# On a pull request the site is built and uploaded as an artifact only, so a broken catalog fails before the tag.
+#
+# No swift-docc-plugin: the kit takes no package dependencies (CLAUDE.md). `xcodebuild docbuild` builds the archives
+# from the package's own schemes; `docc merge` (Xcode 16+) joins them. Needs Pages enabled with source "GitHub Actions"
+# (repository Settings > Pages). Copied from CuboKit's pattern; the module list is read from the .docc catalogs.
+name: Docs
+
+on:
+  push:
+    tags: ['*']
+  pull_request:
+    paths: ['Sources/**/*.docc/**', '.github/workflows/docs.yml', 'tools/build-docs.sh']
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+concurrency:
+  group: docs-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  build:
+    runs-on: macos-latest
+    timeout-minutes: 60
+    steps:
+      - uses: actions/checkout@v4
+      - name: Select the newest Xcode
+        run: |
+          xcode=$(ls -d /Applications/Xcode*.app | sort -V | tail -1)
+          sudo xcode-select -s "$xcode"
+          xcodebuild -version
+      - name: Build the site
+        run: tools/build-docs.sh .docs-site /SpectroKit
+      - uses: actions/upload-pages-artifact@v3
+        with:
+          path: .docs-site
+
+  deploy:
+    needs: build
+    if: startsWith(github.ref, 'refs/tags/')
+    runs-on: ubuntu-latest
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    steps:
+      - id: deployment
+        uses: actions/deploy-pages@v4

.gitignore

@@ -2,3 +2,4 @@
 .DS_Store
 .build/
 .swiftpm/
+.docs-site/