Link-check the book html.

.github/workflows/checks.yml

@@ -69,4 +69,15 @@ jobs:
         # /tB/... permalink that resolves locally. The bare root URL
         # (https://docs.twinbasic.com[/]) is exempt -- intentional "go to
         # the live site" links are allowed.
-        run: python scripts/check_offline_live_links.py
+        run: python scripts/check_offline_live_links.py
+      - name: Check book links (informational)
+        # Failures do not block the build. The book still has absolute
+        # intra-site URLs that the chapter transform has not yet rewritten
+        # and some fragment anchors that are not yet generated. Tracked here
+        # for visibility until those are fixed.
+        continue-on-error: true
+        run: >-
+          python scripts/check_links.py
+          --offline --include-fragments
+          --root-dir docs/_site-pdf
+          docs/_site-pdf/book.html

.github/workflows/jekyll-gh-pages.yml

@@ -102,6 +102,17 @@ jobs:
         # (https://docs.twinbasic.com[/]) is exempt -- intentional "go to
         # the live site" links are allowed.
         run: python scripts/check_offline_live_links.py
+      - name: Check book links (informational)
+        # Failures do not block the build. The book still has absolute
+        # intra-site URLs that the chapter transform has not yet rewritten
+        # and some fragment anchors that are not yet generated. Tracked here
+        # for visibility until those are fixed.
+        continue-on-error: true
+        run: >-
+          python scripts/check_links.py
+          --offline --include-fragments
+          --root-dir docs/_site-pdf
+          docs/_site-pdf/book.html
       - name: Upload Pages artifact
         uses: actions/upload-pages-artifact@v5
         with:

docs/check.bat

@@ -46,6 +46,13 @@
 @echo Checking _site-offline/ for live-site links ...
 @python "%~dp0..\scripts\check_offline_live_links.py"
 @set EXIT3=%ERRORLEVEL%
+@echo.
+@echo Checking _site-pdf/book.html (informational -- failures do not block) ...
+@rem Links in the book are not fully resolved (absolute intra-site URLs stay live
+@rem until the book chapter transform rewrites them, and some fragments are still
+@rem missing). Run for visibility; exit code is intentionally not propagated.
+@%CHECK% --offline --include-fragments --root-dir ".\_site-pdf" ".\_site-pdf\book.html" %*
+@echo.
 @if %EXIT1% NEQ 0 exit /b %EXIT1%
 @if %EXIT2% NEQ 0 exit /b %EXIT2%
 @exit /b %EXIT3%