ci: move GitHub Actions workflows to Node 24 runtimes

Author: Neikon

.github/workflows/build.yml

@@ -15,6 +15,9 @@ on:
       - 'dev/config/**'
   workflow_dispatch:
 
+env:
+  FORCE_JAVASCRIPT_ACTIONS_TO_NODE24: "true"
+
 permissions:
   contents: write
 
@@ -26,11 +29,11 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
 
-      - uses: actions/setup-node@v4
+      - uses: actions/setup-node@v6
         with:
           node-version: 24
           cache: npm

.github/workflows/check-themes.yml

@@ -14,13 +14,16 @@ on:
       - 'dev/config/**'
       - '.github/workflows/**'
 
+env:
+  FORCE_JAVASCRIPT_ACTIONS_TO_NODE24: "true"
+
 jobs:
   validate_pull_requests:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
-      - uses: actions/setup-node@v4
+      - uses: actions/setup-node@v6
         with:
           node-version: 24
           cache: npm

MEMORY.md

@@ -31,6 +31,7 @@ This file stores durable project context so future conversations can resume work
 - `.github/workflows/build.yml`
 - `.github/workflows/check-themes.yml`
 - CI now uses current `actions/checkout@v4` and `actions/setup-node@v4` on Node 24
+- CI workflows now opt into Node 24 for JavaScript actions explicitly and use `actions/checkout@v6` plus `actions/setup-node@v6`
 - Build workflow now runs automatically on pushes to `main` that affect site/build inputs and commits regenerated `docs/` output back to the branch
 - PR validation now runs `npm test` and `npm run build` for site-related changes instead of only checking `themes.json`
 - The build workflow syntax also requires `workflow_dispatch:` with a trailing colon; missing it makes GitHub mark the workflow file as invalid even if other checks still pass