ci: canonical TagBot thin-caller + downgrade-caller cleanup

Replace TagBot.yml with the canonical SciML/.github tagbot.yml@v1 thin
caller, plus a tagbot-subpackages matrix over the registered monorepo
sublibraries (RecursiveArrayToolsArrayPartitionAnyAll,
RecursiveArrayToolsRaggedArrays, RecursiveArrayToolsShorthandConstructors).

Drop hand-maintained skip lists and pinned julia-version floors from the
downgrade callers; the centralized workflow now auto-populates skip
(stdlibs union in-repo sublibs union caller package) and defaults to the
LTS floor.

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

Author: ChrisRackauckas

.github/workflows/Downgrade.yml

@@ -20,7 +20,5 @@ jobs:
           - Core
     uses: "SciML/.github/.github/workflows/downgrade.yml@v1"
     with:
-      julia-version: "1.10"
       group: "${{ matrix.group }}"
-      skip: "Pkg,TOML"
     secrets: "inherit"

.github/workflows/DowngradeSublibraries.yml

@@ -19,7 +19,6 @@ jobs:
     secrets: "inherit"
     with:
       julia-version: "lts"
-      skip: "RecursiveArrayTools,RecursiveArrayToolsArrayPartitionAnyAll,RecursiveArrayToolsRaggedArrays,RecursiveArrayToolsShorthandConstructors,Pkg,TOML,Statistics,LinearAlgebra,SparseArrays,InteractiveUtils,Random,Test"
       group-env-name: "RECURSIVEARRAYTOOLS_TEST_GROUP"
       group-env-value: "Core"
       # Every lib/* sublibrary is downgrade-tested (projects auto-discovered, no exclusions).

.github/workflows/TagBot.yml

@@ -1,53 +1,21 @@
-name: TagBot
-
+name: "TagBot"
 on:
   issue_comment:
-    types:
-      - created
+    types: [created]
   workflow_dispatch:
-    inputs:
-      lookback:
-        default: "3"
-
-permissions:
-  actions: read
-  checks: read
-  contents: write
-  deployments: read
-  issues: read
-  discussions: read
-  packages: read
-  pages: read
-  pull-requests: read
-  repository-projects: read
-  security-events: read
-  statuses: read
-
 jobs:
-  TagBot:
-    if: github.event_name == 'workflow_dispatch' || github.actor == 'JuliaTagBot'
-    runs-on: ubuntu-latest
-    steps:
-      - name: Tag RecursiveArrayTools
-        uses: JuliaRegistries/TagBot@v1
-        with:
-          token: ${{ secrets.GITHUB_TOKEN }}
-          ssh: ${{ secrets.DOCUMENTER_KEY }}
-
-  TagBot-Subpackages:
-    if: github.event_name == 'workflow_dispatch' || github.actor == 'JuliaTagBot'
-    runs-on: ubuntu-latest
+  tagbot:
+    uses: "SciML/.github/.github/workflows/tagbot.yml@v1"
+    secrets: "inherit"
+  tagbot-subpackages:
     strategy:
       fail-fast: false
       matrix:
-        package:
-          - RecursiveArrayToolsArrayPartitionAnyAll
-          - RecursiveArrayToolsRaggedArrays
-          - RecursiveArrayToolsShorthandConstructors
-    steps:
-      - name: Tag ${{ matrix.package }}
-        uses: JuliaRegistries/TagBot@v1
-        with:
-          token: ${{ secrets.GITHUB_TOKEN }}
-          ssh: ${{ secrets.DOCUMENTER_KEY }}
-          subdir: "lib/${{ matrix.package }}"
+        subdir:
+          - "lib/RecursiveArrayToolsArrayPartitionAnyAll"
+          - "lib/RecursiveArrayToolsRaggedArrays"
+          - "lib/RecursiveArrayToolsShorthandConstructors"
+    uses: "SciML/.github/.github/workflows/tagbot.yml@v1"
+    with:
+      subdir: "${{ matrix.subdir }}"
+    secrets: "inherit"