diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 0dfd2da3a..08fe5b4d0 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -1,37 +1,105 @@
 name: CI
 on:
   pull_request:
+  push:
   merge_group:
 
 env:
   MDBOOK_VERSION: 0.4.40
 
 jobs:
-  code-tests:
-    runs-on: ubuntu-latest
-    steps:
-    - uses: actions/checkout@master
-    - name: Update rustup
-      run: rustup self update
-    - name: Install Rust
-      run: |
-        rustup set profile minimal
-        rustup toolchain install nightly
-        rustup default nightly
-    - name: Install mdbook
-      run: |
-        mkdir bin
-        curl -sSL https://github.com/rust-lang/mdBook/releases/download/v${MDBOOK_VERSION}/mdbook-v${MDBOOK_VERSION}-x86_64-unknown-linux-gnu.tar.gz | tar -xz --directory=bin
-        echo "$(pwd)/bin" >> $GITHUB_PATH
-    - name: Report versions
-      run: |
-        rustup --version
-        rustc -Vv
-        mdbook --version
-    - name: Run tests
-      run: mdbook test
+  # code-tests:
+  #   runs-on: ubuntu-latest
+  #   steps:
+  #   - uses: actions/checkout@master
+  #   - name: Update rustup
+  #     run: rustup self update
+  #   - name: Install Rust
+  #     run: |
+  #       rustup set profile minimal
+  #       rustup toolchain install nightly
+  #       rustup default nightly
+  #   - name: Install mdbook
+  #     run: |
+  #       mkdir bin
+  #       curl -sSL https://github.com/rust-lang/mdBook/releases/download/v${MDBOOK_VERSION}/mdbook-v${MDBOOK_VERSION}-x86_64-unknown-linux-gnu.tar.gz | tar -xz --directory=bin
+  #       echo "$(pwd)/bin" >> $GITHUB_PATH
+  #   - name: Report versions
+  #     run: |
+  #       rustup --version
+  #       rustc -Vv
+  #       mdbook --version
+  #   - name: Run tests
+  #     run: mdbook test
+
+  # style-tests:
+  #   runs-on: ubuntu-latest
+  #   steps:
+  #   - uses: actions/checkout@master
+  #   - name: Update rustup
+  #     run: rustup self update
+  #   - name: Install Rust
+  #     run: |
+  #       rustup set profile minimal
+  #       rustup toolchain install nightly -c rust-docs,rustfmt
+  #       rustup default nightly
+  #   - name: Install mdbook
+  #     run: |
+  #       mkdir bin
+  #       curl -sSL https://github.com/rust-lang/mdBook/releases/download/v${MDBOOK_VERSION}/mdbook-v${MDBOOK_VERSION}-x86_64-unknown-linux-gnu.tar.gz | tar -xz --directory=bin
+  #       echo "$(pwd)/bin" >> $GITHUB_PATH
+  #   - name: Report versions
+  #     run: |
+  #       rustup --version
+  #       rustc -Vv
+  #       mdbook --version
+  #   - name: Verify the book builds
+  #     env:
+  #       SPEC_DENY_WARNINGS: 1
+  #     run: mdbook build
+  #   - name: Style checks
+  #     working-directory: style-check
+  #     run: cargo run --locked -- ../src
+  #   - name: Style fmt
+  #     working-directory: style-check
+  #     run: cargo fmt --check
+  #   - name: Check for broken links
+  #     run: |
+  #       curl -sSLo linkcheck.sh \
+  #         https://raw.githubusercontent.com/rust-lang/rust/master/src/tools/linkchecker/linkcheck.sh
+  #       sh linkcheck.sh --all reference
+
+  # mdbook-spec:
+  #   runs-on: ubuntu-latest
+  #   steps:
+  #   - uses: actions/checkout@master
+  #   - name: Update rustup
+  #     run: rustup self update
+  #   - name: Install Rust
+  #     run: |
+  #       rustup set profile minimal
+  #       rustup toolchain install nightly -c rustfmt
+  #       rustup default nightly
+  #   - name: Install mdbook
+  #     run: |
+  #       mkdir bin
+  #       curl -sSL https://github.com/rust-lang/mdBook/releases/download/v${MDBOOK_VERSION}/mdbook-v${MDBOOK_VERSION}-x86_64-unknown-linux-gnu.tar.gz | tar -xz --directory=bin
+  #       echo "$(pwd)/bin" >> $GITHUB_PATH
+  #   - name: Report versions
+  #     run: |
+  #       rustup --version
+  #       rustc -Vv
+  #   - name: Verify mdbook-spec lockfile is current
+  #     working-directory: ./mdbook-spec
+  #     run: cargo update -p mdbook-spec --locked
+  #   - name: Test mdbook-spec
+  #     working-directory: ./mdbook-spec
+  #     run: cargo test
+  #   - name: Rustfmt check
+  #     working-directory: ./mdbook-spec
+  #     run: cargo fmt --check
 
-  style-tests:
+  preview:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@master
@@ -40,78 +108,40 @@ jobs:
     - name: Install Rust
       run: |
         rustup set profile minimal
-        rustup toolchain install nightly -c rust-docs,rustfmt
+        rustup toolchain install nightly
         rustup default nightly
     - name: Install mdbook
       run: |
         mkdir bin
         curl -sSL https://github.com/rust-lang/mdBook/releases/download/v${MDBOOK_VERSION}/mdbook-v${MDBOOK_VERSION}-x86_64-unknown-linux-gnu.tar.gz | tar -xz --directory=bin
         echo "$(pwd)/bin" >> $GITHUB_PATH
-    - name: Report versions
-      run: |
-        rustup --version
-        rustc -Vv
-        mdbook --version
-    - name: Verify the book builds
+    - name: Build the book
       env:
-        SPEC_DENY_WARNINGS: 1
+          SPEC_RELATIVE: 0
       run: mdbook build
-    - name: Style checks
-      working-directory: style-check
-      run: cargo run --locked -- ../src
-    - name: Style fmt
-      working-directory: style-check
-      run: cargo fmt --check
-    - name: Check for broken links
-      run: |
-        curl -sSLo linkcheck.sh \
-          https://raw.githubusercontent.com/rust-lang/rust/master/src/tools/linkchecker/linkcheck.sh
-        sh linkcheck.sh --all reference
-
-  mdbook-spec:
-    runs-on: ubuntu-latest
-    steps:
-    - uses: actions/checkout@master
-    - name: Update rustup
-      run: rustup self update
-    - name: Install Rust
-      run: |
-        rustup set profile minimal
-        rustup toolchain install nightly -c rustfmt
-        rustup default nightly
-    - name: Install mdbook
-      run: |
-        mkdir bin
-        curl -sSL https://github.com/rust-lang/mdBook/releases/download/v${MDBOOK_VERSION}/mdbook-v${MDBOOK_VERSION}-x86_64-unknown-linux-gnu.tar.gz | tar -xz --directory=bin
-        echo "$(pwd)/bin" >> $GITHUB_PATH
-    - name: Report versions
-      run: |
-        rustup --version
-        rustc -Vv
-    - name: Verify mdbook-spec lockfile is current
-      working-directory: ./mdbook-spec
-      run: cargo update -p mdbook-spec --locked
-    - name: Test mdbook-spec
-      working-directory: ./mdbook-spec
-      run: cargo test
-    - name: Rustfmt check
-      working-directory: ./mdbook-spec
-      run: cargo fmt --check
+    - name: Upload artifact
+      # if: github.event_name == 'pull_request'
+      uses: actions/upload-artifact@v4
+      with:
+        # name: preview-${{ github.event.pull_request.number }}
+        name: preview-1234
+        overwrite: true
+        path: book/**
 
   # The success job is here to consolidate the total success/failure state of
   # all other jobs. This job is then included in the GitHub branch protection
   # rule which prevents merges unless all other jobs are passing. This makes
   # it easier to manage the list of jobs via this yml file and to prevent
   # accidentally adding new jobs without also updating the branch protections.
-  success:
-    name: Success gate
-    if: always()
-    needs:
-      - code-tests
-      - style-tests
-      - mdbook-spec
-    runs-on: ubuntu-latest
-    steps:
-      - run: jq --exit-status 'all(.result == "success")' <<< '${{ toJson(needs) }}'
-      - name: Done
-        run: exit 0
+  # success:
+  #   name: Success gate
+  #   if: always()
+  #   needs:
+  #     - code-tests
+  #     - style-tests
+  #     - mdbook-spec
+  #   runs-on: ubuntu-latest
+  #   steps:
+  #     - run: jq --exit-status 'all(.result == "success")' <<< '${{ toJson(needs) }}'
+  #     - name: Done
+  #       run: exit 0
diff --git a/.github/workflows/preview.yml b/.github/workflows/preview.yml
new file mode 100644
index 000000000..34c017a46
--- /dev/null
+++ b/.github/workflows/preview.yml
@@ -0,0 +1,38 @@
+name: Publish Preview
+on:
+  workflow_dispatch:
+    inputs:
+      pr_num:
+        description: "PR number"
+        type: number
+        required: true
+
+permissions:
+  contents: read
+
+jobs:
+  publish:
+    name: Publish preview to GitHub Pages
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+    steps:
+      - name: Download preview
+        uses: actions/download-artifact@v4
+        with:
+          name: preview-1234
+          #github-token: ...
+          #run-id: ...
+      - name: Update GitHub Pages
+        run: |
+          git config user.name "Deploy from CI"
+          git config user.email ""
+          git worktree add --orphan -B gh-pages gh-pages
+          rm -rf gh-pages/pr-1234
+          mkdir gh-pages/pr-1234
+          unzip -n pr-1234.zip -d gh-pages/pr-1234
+          cd gh-pages
+          git add -A
+          git commit -m 'Preview pr-1234'
+          git push origin +gh-pages
+          cd ..