ci: use PyAutoBuild reusable navigator_check workflow

.github/workflows/navigator_check.yml

@@ -1,82 +1,17 @@
 name: Navigator Check
 
+# Thin caller for PyAutoBuild's reusable navigator-catalogue check. The check
+# logic (path/banner lint + catalogue staleness) and its entrypoints live in
+# PyAutoBuild/autobuild; this workspace only declares which generator project to
+# run. See PyAutoLabs/PyAutoBuild/.github/workflows/navigator_check.yml.
+
 on: [push, pull_request]
 
 permissions:
   contents: read
 
-# Generator project target for the staleness job. Porting this workflow to
-# another workspace is a one-word change here.
-env:
-  PROJECT: autofit
-
 jobs:
-  paths:
-    name: Navigator paths + banner lint
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout repo
-        uses: actions/checkout@v4
-      - name: Set up Python
-        uses: actions/setup-python@v5
-        with:
-          python-version: '3.12'
-      - name: Install dependencies
-        run: pip install --quiet pyyaml
-      - name: Run navigator checker (paths hard, banners fail)
-        run: python .github/scripts/check_navigator.py --banners=fail
-
-  staleness:
-    name: Catalogue staleness
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout workspace
-        uses: actions/checkout@v4
-        with:
-          path: workspace
-      - name: Checkout PyAutoBuild
-        uses: actions/checkout@v4
-        with:
-          repository: PyAutoLabs/PyAutoBuild
-          path: PyAutoBuild
-      - name: Set up Python
-        uses: actions/setup-python@v5
-        with:
-          python-version: '3.12'
-      - name: Extract branch name
-        id: extract_branch
-        shell: bash
-        run: |
-          cd workspace
-          echo "branch=${GITHUB_HEAD_REF:-${GITHUB_REF#refs/heads/}}" >> "$GITHUB_OUTPUT"
-      - name: Match PyAutoBuild branch
-        shell: bash
-        run: |
-          BRANCH="${{ steps.extract_branch.outputs.branch }}"
-          pushd PyAutoBuild
-          if [[ -n "$(git ls-remote --heads origin "$BRANCH")" ]]; then
-            echo "Branch $BRANCH exists in PyAutoBuild — checking out"
-            git fetch origin "$BRANCH"
-            git checkout "$BRANCH"
-          else
-            echo "Branch $BRANCH not in PyAutoBuild — staying on default branch"
-          fi
-          popd
-      - name: Install dependencies
-        run: pip install --quiet pyyaml
-      - name: Regenerate catalogue (Phase 2 only — no notebook rebuild)
-        env:
-          NAVIGATOR_PROJECT: ${{ env.PROJECT }}
-          PYAUTOBUILD_DIR: ${{ github.workspace }}/PyAutoBuild/autobuild
-        run: |
-          cd workspace
-          python .github/scripts/regenerate_navigator.py
-      - name: Fail if catalogue drifted from scripts
-        shell: bash
-        run: |
-          cd workspace
-          if ! git diff --exit-code llms-full.txt workspace_index.json; then
-            echo "::error::llms-full.txt / workspace_index.json are stale."
-            echo "Regenerate with 'generate.py ${{ env.PROJECT }}' and commit the result."
-            exit 1
-          fi
+  navigator:
+    uses: PyAutoLabs/PyAutoBuild/.github/workflows/navigator_check.yml@main
+    with:
+      project: autofit