Fix _posts YAML and enable pmlint posts CI

.github/workflows/pmlint-posts.yml

@@ -0,0 +1,46 @@
+# pmlint posts — validate _posts YAML on correction PRs (published volumes)
+# Copy into a volume repository as .github/workflows/pmlint-posts.yml
+# Checks out latest mlresearch/papersite and runs `pmlint posts --check`.
+#
+# Prefer enabling this on the branch that holds `_posts/` (often gh-pages).
+
+name: pmlint-posts
+
+on:
+  pull_request:
+    paths:
+      - "_posts/**"
+  workflow_dispatch:
+
+jobs:
+  check-posts:
+    if: startsWith(github.event.repository.name, 'v') || startsWith(github.event.repository.name, 'r')
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout volume
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Checkout papersite tooling
+        uses: actions/checkout@v4
+        with:
+          repository: mlresearch/papersite
+          path: .papersite-tools
+
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: "3.0"
+
+      - name: Run pmlint posts --check
+        env:
+          PAPERSITE_ROOT: ${{ github.workspace }}/.papersite-tools
+          PMLINT_SKIP_UPDATE: "1"
+        run: |
+          # Full tree on workflow_dispatch; PR path uses changed posts vs base
+          if [[ "${{ github.event_name }}" == "pull_request" ]]; then
+            bash "$PAPERSITE_ROOT/bin/pmlint" posts --check --changed --base "origin/${{ github.base_ref }}"
+          else
+            bash "$PAPERSITE_ROOT/bin/pmlint" posts --check
+          fi

_posts/2022-06-28-he22e.md

@@ -18,8 +18,7 @@ publisher: PMLR
 issn: 2640-3498
 id: he22e
 month: 0
-tex_title: A Reduction from Linear Contextual Bandit Lower Bounds to Estimation Lower
-  Bounds
+tex_title: A Reduction from Linear Contextual Bandits Lower Bounds to Estimations Lower Bounds
 firstpage: 8660
 lastpage: 8677
 page: 8660-8677