♻️ Run doc-test generation as an explicit CI step

Drop the `pretest:ci` lifecycle hook and call `create:doc-tests` from the
`build` job before `test:ci`. The hook hid the step from the job log and
made `test:ci` behave differently under npm than when run directly.

.gitea/workflows/ci.yml

@@ -77,6 +77,10 @@ jobs:
             - run: npm ci
             - run: npm run build
             - run: npm run check
+            # Compile the prose examples into gitignored tests. Kept as an
+            # explicit step (not a `pretest:ci` hook) so it is visible in the
+            # job log and `test:ci` stays a plain command.
+            - run: npm run create:doc-tests
             # Fails the build below 100% coverage on `src/` (`c8 --all --100`);
             # the same run produces the report published below. See
             # development/ci.md § Coverage threshold.