Add standard SciML workflows: FormatCheck and SpellCheck (#38)

Adds the centralized-caller Format check (Runic) and Spell check
workflows to bring ConcreteStructs.jl in line with the SciML
standard CI uniformization.

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/FormatCheck.yml

@@ -0,0 +1,16 @@
+name: format-check
+
+on:
+  push:
+    branches:
+      - 'master'
+      - 'main'
+      - 'release-'
+    tags: '*'
+  pull_request:
+
+jobs:
+  runic:
+    name: "Runic"
+    uses: "SciML/.github/.github/workflows/runic.yml@v1"
+    secrets: "inherit"

.github/workflows/SpellCheck.yml

@@ -0,0 +1,9 @@
+name: Spell Check
+
+on: [pull_request]
+
+jobs:
+  typos-check:
+    name: "Spell Check with Typos"
+    uses: "SciML/.github/.github/workflows/spellcheck.yml@v1"
+    secrets: "inherit"