ci: add Sublibrary CI via centralized project-model workflow

This monorepo had no sublibrary CI, so its lib/* sublibraries were never
tested. Add a thin caller of the centralized sublibrary-project-tests.yml,
which lists lib/* and tests each via tests.yml project=lib/X.

Co-Authored-By: Chris Rackauckas <accounts@chrisrackauckas.com>
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: ChrisRackauckas

.github/workflows/SublibraryCI.yml

@@ -0,0 +1,22 @@
+name: Sublibrary CI
+
+on:
+  pull_request:
+    branches:
+      - master
+    paths-ignore:
+      - 'docs/**'
+  push:
+    branches:
+      - master
+    paths-ignore:
+      - 'docs/**'
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: ${{ startsWith(github.ref, 'refs/pull/') }}
+
+jobs:
+  sublibraries:
+    uses: "SciML/.github/.github/workflows/sublibrary-project-tests.yml@v1"
+    secrets: "inherit"