Add Hacker News demo comparison, lessons learned, and repo status docs

.github/workflows/ci.yml

@@ -38,7 +38,7 @@ jobs:
           bundler-cache: true
 
       - name: Prepare RuboCop cache
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         env:
           DEPENDENCIES_HASH: ${{ hashFiles('.ruby-version', '**/.rubocop.yml', '**/.rubocop_todo.yml', 'Gemfile.lock') }}
         with:
@@ -76,6 +76,21 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v6
 
+      - name: Set up pnpm
+        uses: pnpm/action-setup@v4
+        with:
+          version: 10.22.0
+          run_install: false
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 24.8.0
+          cache: pnpm
+
+      - name: Install JavaScript dependencies
+        run: pnpm install --frozen-lockfile
+
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with:
@@ -115,6 +130,21 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v6
 
+      - name: Set up pnpm
+        uses: pnpm/action-setup@v4
+        with:
+          version: 10.22.0
+          run_install: false
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 24.8.0
+          cache: pnpm
+
+      - name: Install JavaScript dependencies
+        run: pnpm install --frozen-lockfile
+
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with:
@@ -129,7 +159,7 @@ jobs:
         run: bin/rails db:test:prepare test:system
 
       - name: Keep screenshots from failed system tests
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         if: failure()
         with:
           name: screenshots

.ruby-version

@@ -0,0 +1 @@
+ruby-3.4.3

.tool-versions

@@ -0,0 +1,2 @@
+ruby 3.4.3
+node 24.8.0