ci: improve GitHub Actions and docs

- Update Node.js versions to match requirements
- Add explicit Node-RED installation
- Add test environment variable
- Split steps for better error tracking
- Fix NIP-40 formatting in README

Author: vveerrgg

.github/workflows/test.yml

@@ -12,15 +12,27 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [14.x, 16.x, 18.x]
+        node-version: [16.x, 18.x, 20.x]
 
     steps:
     - uses: actions/checkout@v3
+    
     - name: Use Node.js ${{ matrix.node-version }}
       uses: actions/setup-node@v3
       with:
         node-version: ${{ matrix.node-version }}
         cache: 'npm'
-    - run: npm ci
-    - run: npm run build --if-present
-    - run: npm test
+    
+    - name: Install dependencies
+      run: npm ci
+      
+    - name: Install Node-RED (required for tests)
+      run: npm install -g node-red@latest
+      
+    - name: Build
+      run: npm run build
+      
+    - name: Run tests
+      run: npm test
+      env:
+        NODE_ENV: test

README.md

@@ -187,7 +187,7 @@ docker compose -f docker-compose.dev.yml up
 | [NIP-15](https://github.com/nostr-protocol/nips/blob/master/15.md) | End of Stored Events Notice | ✅ Implemented |
 | [NIP-20](https://github.com/nostr-protocol/nips/blob/master/20.md) | Command Results | ✅ Implemented |
 | [NIP-28](https://github.com/nostr-protocol/nips/blob/master/28.md) | Public Chat | 🚧 Planned |
-| [40](https://github.com/nostr-protocol/nips/blob/master/40.md) | Expiration Timestamp | 🚧 Planned |
+| [NIP-40](https://github.com/nostr-protocol/nips/blob/master/40.md) | Expiration Timestamp | 🚧 Planned |
 
 Legend:
 - ✅ Implemented: Fully supported