docs: harmonize onboarding and contribution guidance

.github/copilot-instructions.md

@@ -1,3 +1,13 @@
+## Copilot Code Review
+
+When performing a code review, read [CONTRIBUTING.md](../CONTRIBUTING.md), apply
+its [Component PR Rationale and Evidence](../CONTRIBUTING.md#component-pr-rationale-and-evidence)
+requirements, and follow its [Reviewing Component Guidance](../CONTRIBUTING.md#reviewing-component-guidance)
+procedure. Treat missing or misleading selection guidance and crosslinks as
+review findings, not merely optional prose improvements. Scope findings to new
+or materially changed components and guidance affected by the PR; do not demand
+a catalog-wide documentation rewrite for an unrelated change.
+
 ## Code Quality Principles
 
 <!-- https://github.com/mieweb/template-mieweb-opensource/blob/main/.github/copilot-instructions.md -->

.github/workflows/ci.yml

@@ -26,7 +26,7 @@ jobs:
       - name: Setup Node.js
         uses: actions/setup-node@v4
         with:
-          node-version: '20'
+          node-version: '24'
           cache: 'pnpm'
 
       - name: Install dependencies
@@ -62,7 +62,7 @@ jobs:
       - name: Setup Node.js
         uses: actions/setup-node@v4
         with:
-          node-version: '20'
+          node-version: '24'
           cache: 'pnpm'
 
       - name: Install dependencies
@@ -98,7 +98,7 @@ jobs:
       - name: Setup Node.js
         uses: actions/setup-node@v4
         with:
-          node-version: '20'
+          node-version: '24'
           cache: 'pnpm'
 
       - name: Install dependencies
@@ -146,7 +146,7 @@ jobs:
       - name: Setup Node.js
         uses: actions/setup-node@v4
         with:
-          node-version: '20'
+          node-version: '24'
           cache: 'pnpm'
 
       - name: Install dependencies
@@ -188,7 +188,7 @@ jobs:
       - name: Setup Node.js
         uses: actions/setup-node@v4
         with:
-          node-version: '20'
+          node-version: '24'
           cache: 'pnpm'
 
       - name: Install dependencies
@@ -245,7 +245,7 @@ jobs:
       - name: Setup Node.js
         uses: actions/setup-node@v4
         with:
-          node-version: '20'
+          node-version: '24'
           cache: 'pnpm'
 
       - name: Run security audit

.github/workflows/create-release.yml

@@ -33,7 +33,7 @@ jobs:
       - name: Setup Node.js
         uses: actions/setup-node@v4
         with:
-          node-version: '20'
+          node-version: '24'
           cache: 'pnpm'
 
       - name: Configure Git