diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
new file mode 100644
index 0000000..33b8e09
--- /dev/null
+++ b/.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/SimulatoKit/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 /SimulatoKit
+      - 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: ${{ steps.deployment.outputs.page_url }}
+    steps:
+      - id: deployment
+        uses: actions/deploy-pages@v4
diff --git a/.gitignore b/.gitignore
index 4114e8e..5bb4aa8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,3 +4,4 @@
 .swiftpm/
 *.xcresult
 /Examples/output/
+.docs-site/
diff --git a/Tests/Fixtures/README.md b/Tests/Fixtures/README.md
new file mode 100644
index 0000000..476fa00
--- /dev/null
+++ b/Tests/Fixtures/README.md
@@ -0,0 +1,21 @@
+# Test fixtures
+
+One row per committed fixture file under `Tests/*/Fixtures/`: size, the script under `tools/` that names it (the generator or its
+pin script; a few scripts write a whole directory; a script found only by file-name prefix, tool-folder name or test module is marked so), and a note where the origin is not the kit's own pinned reference. 10 files.
+
+Licence: every fixture is generated from this kit's own code and the pinned Python reference (see `CLAUDE.md`, Reference) and ships under the kit's GPL-3.0-or-later licence, except the rows marked *third party*. Nothing here is the owner's data: the committed text fixtures carry no owner path or name (checked by search), and real datasets are read from `$MACEM_DATA` and never copied into the repo.
+
+## All fixtures
+
+| File | Size | Generated by | Note |
+|---|---|---|---|
+| `SimulatoKitParityTests/Fixtures/slice-1-arrays.bin` | 12.7 MB | `tools/slice-1/pins.py` |  |
+| `SimulatoKitParityTests/Fixtures/slice-1-pins.json` | 169.8 KB | `tools/slice-1/pins.py` |  |
+| `SimulatoKitParityTests/Fixtures/slice-2-arrays.bin` | 1.4 MB | `tools/slice-2/pins.py` |  |
+| `SimulatoKitParityTests/Fixtures/slice-2-pins.json` | 43.3 KB | `tools/slice-2/pins.py` |  |
+| `SimulatoKitParityTests/Fixtures/slice-3-arrays.bin` | 1.5 MB | `tools/slice-3/pins.py` |  |
+| `SimulatoKitParityTests/Fixtures/slice-3-pins.json` | 7.2 KB | `tools/slice-3/pins.py` |  |
+| `SimulatoKitParityTests/Fixtures/slice-4-arrays.bin` | 421.9 KB | `tools/slice-4/pins.py` |  |
+| `SimulatoKitParityTests/Fixtures/slice-4-pins.json` | 2.6 KB | `tools/slice-4/pins.py` |  |
+| `SimulatoKitParityTests/Fixtures/slice-4-scan-arrays.bin` | 1.2 MB | `tools/slice-4/scan_pins.py` |  |
+| `SimulatoKitParityTests/Fixtures/slice-4-scan-pins.json` | 1.3 KB | `tools/slice-4/scan_pins.py` |  |
diff --git a/tools/build-docs.sh b/tools/build-docs.sh
new file mode 100755
index 0000000..127890f
--- /dev/null
+++ b/tools/build-docs.sh
@@ -0,0 +1,26 @@
+#!/bin/bash
+# Builds the DocC site for every module with a .docc catalog and merges it into one static site.
+#   tools/build-docs.sh <output-dir> [<hosting-base-path>]     e.g. tools/build-docs.sh .docs-site /SimulatoKit
+# macOS with Xcode 16 or later. Output is gitignored (.docs-site).
+set -euo pipefail
+cd "$(dirname "$0")/.."
+out="${1:?output dir}"
+base="${2:-}"
+derived="$(mktemp -d)"
+trap 'rm -rf "$derived"' EXIT
+
+modules=$(find Sources -maxdepth 2 -name '*.docc' -exec basename {} .docc \; | sort)
+archives=()
+for m in $modules; do
+  xcodebuild docbuild -scheme "$m" -destination 'generic/platform=macOS' -derivedDataPath "$derived" >"$derived/$m.log" 2>&1 \
+    || { tail -30 "$derived/$m.log"; echo "docbuild failed for $m"; exit 1; }
+  archives+=("$(find "$derived/Build/Products" -name "$m.doccarchive" -maxdepth 3 | head -1)")
+done
+
+merged="$derived/SimulatoKit.doccarchive"
+xcrun docc merge "${archives[@]}" --output-path "$merged"
+rm -rf "$out"
+xcrun docc process-archive transform-for-static-hosting "$merged" --output-path "$out" ${base:+--hosting-base-path "$base"}
+# the site root has no page of its own: send it to the merged documentation landing page
+printf '<!doctype html><meta charset="utf-8"><meta http-equiv="refresh" content="0; url=%s/documentation/">' "${base}" > "$out/index.html"
+echo "built $out ($(echo "$modules" | wc -l | tr -d ' ') modules)"