ci: uniformize onto centralized CI (project-model SublibraryCI + cleanup) (#954)

* ci(SublibraryCI): test each lib/* via project-model tests.yml@v1 caller

Switch SublibraryCI from the GROUP-dispatch sublibrary-tests.yml@v1 (which
needs a root runtests.jl sublib dispatcher) to the project model: list lib/*
and run each as a tests.yml@v1 caller with project: lib/X. The reusable
workflow transitively git-develops the sublib's in-repo [sources] deps, so no
per-repo dispatcher is needed.

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

* ci(SublibraryCI): collect sublibrary coverage (point dirs at lib/X)

Drop coverage: false (cargo-culted from OrdinaryDiffEq, which disables it
only to avoid Codecov flooding at 56-sublibrary scale). For this repo the
sublib tests are the only thing covering the sublib's src, so collect it --
with coverage-directories pointed at the sublibrary (lib/X/src,ext) rather
than the repo-root default (src,ext).

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

* ci(SublibraryCI): build the matrix JSON with jq, not python3

Don't assume python3 is on the runner. jq is preinstalled on GitHub-hosted
ubuntu runners (where the list-sublibraries job runs) and builds the JSON
array directly.

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

* ci(SublibraryCI): build matrix JSON in pure shell (no jq/python3)

jq isn't guaranteed on self-hosted runners any more than python3 is. lib/*
directory names have no JSON-special characters, so build the array with
plain shell quoting and depend on neither.

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

* ci(SublibraryCI): call centralized sublibrary-project-tests.yml@v1

The list-lib/*-and-matrix logic moved into the reusable
sublibrary-project-tests.yml in SciML/.github, so this caller collapses to
just the branch triggers, concurrency, and a single `uses:`. No duplicated
detection logic per repo.

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

* ci: uniformize — rm-CompatHelper add-DocPreviewCleanup

Part of bringing this repo onto the full centralized CI setup (SciML/.github
@v1): remove retired CompatHelper (Dependabot drives [compat]) and/or add the
centralized Documenter preview cleanup.

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

---------

Co-authored-by: ChrisRackauckas-Claude <accounts@chrisrackauckas.com>
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: 3 people

.github/workflows/CompatHelper.yml

@@ -0,0 +1,17 @@
+name: Doc Preview Cleanup
+
+on:
+  pull_request:
+    types: [closed]
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: write
+
+jobs:
+  doc-preview-cleanup:
+    uses: "SciML/.github/.github/workflows/docs-preview-cleanup.yml@v1"
+    secrets: "inherit"

.github/workflows/DocPreviewCleanup.yml

@@ -13,13 +13,10 @@ on:
       - 'docs/**'
 
 concurrency:
-  # Skip intermediate builds: always.
-  # Cancel intermediate builds: only if it is a pull request build.
   group: ${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: ${{ startsWith(github.ref, 'refs/pull/') }}
 
 jobs:
-  sublibrary-ci:
-    name: "Sublibrary CI"
-    uses: "SciML/.github/.github/workflows/sublibrary-tests.yml@v1"
+  sublibraries:
+    uses: "SciML/.github/.github/workflows/sublibrary-project-tests.yml@v1"
     secrets: "inherit"