diff --git a/.github/actions/setup/action.yml b/.github/actions/setup/action.yml
new file mode 100644
index 0000000..6bd6bcb
--- /dev/null
+++ b/.github/actions/setup/action.yml
@@ -0,0 +1,15 @@
+name: 'Setup Node.js environment'
+description: 'Configure Node.js 22 with npm cache and install dependencies'
+
+runs:
+  using: composite
+  steps:
+    - name: Set up Node.js
+      uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6.4.0
+      with:
+        node-version: '22'
+        cache: 'npm'
+
+    - name: Install dependencies
+      run: npm ci
+      shell: bash
diff --git a/.github/workflows/unit-tests.yml b/.github/workflows/ci.yml
similarity index 56%
rename from .github/workflows/unit-tests.yml
rename to .github/workflows/ci.yml
index 1f4fd11..7f4d83a 100644
--- a/.github/workflows/unit-tests.yml
+++ b/.github/workflows/ci.yml
@@ -1,6 +1,8 @@
-name: Unit Tests
+name: CI
 
 on:
+  schedule:
+    - cron: '0 9 * * 1'  # Every Monday at 09:00 UTC
   push:
     branches:
       - main
@@ -14,13 +16,16 @@ jobs:
   changes:
     runs-on: ubuntu-latest
     outputs:
-      code: ${{ steps.filter.outputs.code }}
+      # On scheduled runs there is no diff to compare — always run tests.
+      # On push/PR, only run when relevant files changed.
+      code: ${{ github.event_name == 'schedule' || steps.filter.outputs.code == 'true' }}
     steps:
       - name: Checkout
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
 
       - name: Detect relevant file changes
         uses: dorny/paths-filter@fbd0ab8f3e69293af611ebaee6363fc25e6d187d # v4.0.1
+        if: github.event_name != 'schedule'
         id: filter
         with:
           filters: |
@@ -36,17 +41,8 @@ jobs:
     if: needs.changes.outputs.code == 'true'
     runs-on: ubuntu-latest
     steps:
-      - name: Checkout
-        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
-
-      - name: Set up Node.js
-        uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6.4.0
-        with:
-          node-version: '22'
-          cache: 'npm'
-
-      - name: Install dependencies
-        run: npm ci
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - uses: ./.github/actions/setup
 
       - name: Build generated files needed for tests
         run: npm run build:milestones && npm run build:js
@@ -65,6 +61,23 @@ jobs:
           verbose: true
           fail_ci_if_error: false
 
+  test-e2e:
+    needs: changes
+    if: needs.changes.outputs.code == 'true'
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - uses: ./.github/actions/setup
+
+      - name: Install Playwright browsers
+        run: npx playwright install --with-deps chromium
+
+      - name: Build generated files
+        run: npm run build
+
+      - name: Run E2E tests
+        run: npm run test:e2e
+
   unit-test-status:
     needs: [changes, test]
     if: always()
@@ -77,3 +90,16 @@ jobs:
             exit 1
           fi
           echo "Unit tests passed or were skipped (no relevant files changed)"
+
+  e2e-test-status:
+    needs: [changes, test-e2e]
+    if: always()
+    runs-on: ubuntu-latest
+    steps:
+      - name: Report status
+        run: |
+          if [[ "${{ needs.test-e2e.result }}" == "failure" ]]; then
+            echo "E2E tests failed"
+            exit 1
+          fi
+          echo "E2E tests passed or were skipped (no relevant files changed)"
diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
index 94cc553..fdde754 100644
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/deploy.yml
@@ -20,32 +20,11 @@ jobs:
       name: github-pages
       url: https://nitrocode.github.io/token-deathclock/
     steps:
-      - name: Checkout
-        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - uses: ./.github/actions/setup
 
-      - name: Set up Node.js
-        uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6.4.0
-        with:
-          node-version: '22'
-          cache: 'npm'
-
-      - name: Install dependencies
-        run: npm ci
-
-      - name: Regenerate milestones-data.js from YAML
-        run: npm run build:milestones
-
-      - name: Regenerate changelog-data.js from CHANGELOG.md
-        run: npm run build:changelog
-
-      - name: Regenerate project-stats-data.js from YAML
-        run: npm run build:project-stats
-
-      - name: Rebuild script.js from src/js/ source files
-        run: npm run build:js
-
-      - name: Rebuild styles.css from styles/ source files
-        run: npm run build:css
+      - name: Build all generated files
+        run: npm run build
 
       - name: Deploy to GitHub Pages (gh-pages branch)
         uses: peaceiris/actions-gh-pages@4f9cc6602d3f66b9c108549d475ec49e8ef4d45e # v4.0.0
diff --git a/.github/workflows/e2e-tests.yml b/.github/workflows/e2e-tests.yml
deleted file mode 100644
index 450d97b..0000000
--- a/.github/workflows/e2e-tests.yml
+++ /dev/null
@@ -1,71 +0,0 @@
-name: E2E Tests
-
-on:
-  push:
-    branches:
-      - main
-  pull_request:
-  merge_group:
-
-permissions:
-  contents: read
-
-jobs:
-  changes:
-    runs-on: ubuntu-latest
-    outputs:
-      code: ${{ steps.filter.outputs.code }}
-    steps:
-      - name: Checkout
-        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
-
-      - name: Detect relevant file changes
-        uses: dorny/paths-filter@fbd0ab8f3e69293af611ebaee6363fc25e6d187d # v4.0.1
-        id: filter
-        with:
-          filters: |
-            code:
-              - '**/*.js'
-              - '**/*.ts'
-              - '**/*.css'
-              - 'tests/**'
-              - 'package*.json'
-
-  test-e2e:
-    needs: changes
-    if: needs.changes.outputs.code == 'true'
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout
-        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
-
-      - name: Set up Node.js
-        uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6.4.0
-        with:
-          node-version: '22'
-          cache: 'npm'
-
-      - name: Install dependencies
-        run: npm ci
-
-      - name: Install Playwright browsers
-        run: npx playwright install --with-deps chromium
-
-      - name: Build generated files
-        run: npm run build
-
-      - name: Run E2E tests
-        run: npm run test:e2e
-
-  e2e-test-status:
-    needs: [changes, test-e2e]
-    if: always()
-    runs-on: ubuntu-latest
-    steps:
-      - name: Report status
-        run: |
-          if [[ "${{ needs.test-e2e.result }}" == "failure" ]]; then
-            echo "E2E tests failed"
-            exit 1
-          fi
-          echo "E2E tests passed or were skipped (no relevant files changed)"
diff --git a/.github/workflows/preview.yml b/.github/workflows/preview.yml
index 1596bfb..1522793 100644
--- a/.github/workflows/preview.yml
+++ b/.github/workflows/preview.yml
@@ -12,17 +12,8 @@ jobs:
   preview:
     runs-on: ubuntu-latest
     steps:
-      - name: Checkout
-        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
-
-      - name: Set up Node.js
-        uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6.4.0
-        with:
-          node-version: '22'
-          cache: 'npm'
-
-      - name: Install dependencies
-        run: npm ci
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - uses: ./.github/actions/setup
 
       - name: Build all generated files
         run: npm run build
@@ -35,8 +26,8 @@ jobs:
           destination_dir: previews/pr-${{ github.event.number }}
           # Preserve existing previews and production files
           keep_files: true
-          # Exclude non-site files
-          exclude_assets: '.github,node_modules,tests,scripts,package-lock.json,package.json,milestones.yaml'
+          # Exclude non-site files (keep in sync with deploy.yml)
+          exclude_assets: '.github,node_modules,tests,scripts,package-lock.json,package.json,milestones.yaml,project-stats.yaml'
 
       - name: Post or update preview URL comment
         uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
diff --git a/.github/workflows/weekly-stats-check.yml b/.github/workflows/weekly-stats-check.yml
new file mode 100644
index 0000000..3220fce
--- /dev/null
+++ b/.github/workflows/weekly-stats-check.yml
@@ -0,0 +1,100 @@
+name: Weekly Project Stats Check
+
+# Opens a reminder issue when the recorded pr_count in project-stats.yaml
+# is lower than the actual number of merged PRs in the repository.
+
+on:
+  schedule:
+    - cron: '0 9 * * 1'  # Every Monday at 09:00 UTC
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  issues: write
+
+jobs:
+  check-stats:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+
+      - name: Check project-stats.yaml against actual merged PR count
+        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
+        with:
+          script: |
+            const fs = require('fs');
+
+            // Read the recorded pr_count from project-stats.yaml
+            const yaml = fs.readFileSync('project-stats.yaml', 'utf8');
+            const match = yaml.match(/^pr_count:\s*(\d+)/m);
+            if (!match) {
+              throw new Error('Invalid or missing pr_count in project-stats.yaml');
+            }
+            const recordedCount = parseInt(match[1], 10);
+            if (!Number.isInteger(recordedCount)) {
+              throw new Error('Invalid or missing pr_count in project-stats.yaml');
+            }
+
+            // Count actual merged PRs via the GitHub API
+            let page = 1;
+            let totalMerged = 0;
+            while (true) {
+              const { data } = await github.rest.pulls.list({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                state: 'closed',
+                per_page: 100,
+                page,
+              });
+              if (data.length === 0) break;
+              totalMerged += data.filter(pr => pr.merged_at !== null).length;
+              if (data.length < 100) break;
+              page++;
+            }
+
+            console.log(`Recorded pr_count: ${recordedCount}, actual merged PRs: ${totalMerged}`);
+
+            if (recordedCount >= totalMerged) {
+              console.log('project-stats.yaml is up to date — no action needed.');
+              return;
+            }
+
+            const title = `chore: update project-stats.yaml (recorded ${recordedCount}, actual ${totalMerged} merged PRs)`;
+            const body = [
+              '## 📊 Project Stats Are Out of Date',
+              '',
+              `**Recorded \`pr_count\`:** ${recordedCount}`,
+              `**Actual merged PRs:** ${totalMerged}`,
+              `**Difference:** ${totalMerged - recordedCount} untracked PR(s)`,
+              '',
+              'After the next agent session, update `project-stats.yaml`:',
+              '',
+              '```yaml',
+              `pr_count: ${totalMerged}`,
+              '```',
+              '',
+              'Then run `npm run build:project-stats` to regenerate `project-stats-data.js`, or let the deploy workflow handle it.',
+            ].join('\n');
+
+            // Avoid duplicate open issues (paginate to cover all open items, exclude PRs)
+            const openIssues = await github.paginate(github.rest.issues.listForRepo, {
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              state: 'open',
+            });
+            const duplicate = openIssues.find(i =>
+              i.title.startsWith('chore: update project-stats.yaml') && !i.pull_request
+            );
+            if (duplicate) {
+              console.log(`Reminder issue already open: #${duplicate.number} — skipping.`);
+              return;
+            }
+
+            const { data: issue } = await github.rest.issues.create({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              title,
+              body,
+            });
+            console.log(`Created reminder issue: #${issue.number}`);
diff --git a/scripts/build-bundle.js b/scripts/build-bundle.js
new file mode 100644
index 0000000..4b16c52
--- /dev/null
+++ b/scripts/build-bundle.js
@@ -0,0 +1,67 @@
+#!/usr/bin/env node
+/**
+ * build-bundle.js
+ *
+ * Shared helper used by build-js.js and build-css.js.
+ * Concatenates an ordered list of source files, optionally wraps them with a
+ * header and footer string, then minifies the result with esbuild.
+ *
+ * This module is not a standalone script — import it via require().
+ *
+ * @example
+ *   const { buildBundle } = require('./build-bundle');
+ *   buildBundle({ parts, srcDir, outPath, loader: 'css' });
+ */
+
+'use strict';
+
+const fs      = require('fs');
+const path    = require('path');
+const esbuild = require('esbuild');
+
+/**
+ * Build a minified bundle from an ordered list of source files.
+ *
+ * @param {object}          opts
+ * @param {string[]}        opts.parts           - Ordered source file names
+ * @param {string}          opts.srcDir          - Directory that contains the source files
+ * @param {string}          opts.outPath         - Absolute path for the output file
+ * @param {'js'|'css'}      opts.loader          - esbuild loader type
+ * @param {string}          [opts.header]        - Text prepended before minification
+ * @param {string}          [opts.footer]        - Text appended before minification
+ * @param {object}          [opts.esbuildOptions]- Extra options merged into the esbuild call
+ */
+function buildBundle(opts) {
+  const chunks = opts.parts.map((file) => {
+    const fullPath = path.join(opts.srcDir, file);
+    if (!fs.existsSync(fullPath)) {
+      throw new Error(`Missing source file: ${file}`);
+    }
+    return fs.readFileSync(fullPath, 'utf8');
+  });
+
+  // Concatenate with explicit newline separators so files without trailing
+  // newlines don't accidentally merge tokens across boundaries.
+  let unminified = chunks.join('\n');
+  if (opts.header) unminified = opts.header + '\n' + unminified;
+  if (opts.footer) unminified = unminified + '\n' + opts.footer;
+
+  const esbuildOpts = Object.assign(
+    { minify: true, loader: opts.loader },
+    opts.esbuildOptions || {},
+  );
+
+  const result = esbuild.transformSync(unminified, esbuildOpts);
+  fs.writeFileSync(opts.outPath, result.code);
+
+  const outName = path.basename(opts.outPath);
+  const ratio   = unminified.length === 0
+    ? '0.0'
+    : ((1 - result.code.length / unminified.length) * 100).toFixed(1);
+  console.log(
+    `${outName} rebuilt from ${opts.parts.length} source files ` +
+    `(${unminified ? unminified.split('\n').length : 0} lines → ${result.code.length} bytes, −${ratio}% via esbuild minification)`,
+  );
+}
+
+module.exports = { buildBundle };
diff --git a/scripts/build-css.js b/scripts/build-css.js
index c68867a..2e82384 100644
--- a/scripts/build-css.js
+++ b/scripts/build-css.js
@@ -14,9 +14,8 @@
 
 'use strict';
 
-const fs      = require('fs');
-const path    = require('path');
-const esbuild = require('esbuild');
+const path = require('path');
+const { buildBundle } = require('./build-bundle');
 
 const ROOT = path.resolve(__dirname, '..');
 
@@ -36,30 +35,9 @@ const PARTS = [
   'scary-features.css',
 ];
 
-const chunks = PARTS.map((file) => {
-  const fullPath = path.join(ROOT, 'styles', file);
-  if (!fs.existsSync(fullPath)) {
-    throw new Error(`Missing source file: styles/${file}`);
-  }
-  return fs.readFileSync(fullPath, 'utf8');
-});
-
-// Concatenate directly — each source file preserves its own trailing blank lines
-// so no additional separator is needed.
-const unminified = chunks.join('');
-
-const outPath = path.join(ROOT, 'styles.css');
-
-// Minify with esbuild (synchronous transform API — no temp files needed).
-const result = esbuild.transformSync(unminified, {
-  minify: true,
+buildBundle({
+  parts:  PARTS,
+  srcDir: path.join(ROOT, 'styles'),
+  outPath: path.join(ROOT, 'styles.css'),
   loader: 'css',
 });
-
-fs.writeFileSync(outPath, result.code);
-
-const ratio = ((1 - result.code.length / unminified.length) * 100).toFixed(1);
-console.log(
-  `styles.css rebuilt from ${PARTS.length} source files ` +
-  `(${unminified.split('\n').length - 1} lines → ${result.code.length} bytes, −${ratio}% via esbuild minification)`,
-);
diff --git a/scripts/build-js.js b/scripts/build-js.js
index 71551db..dd8ae90 100644
--- a/scripts/build-js.js
+++ b/scripts/build-js.js
@@ -15,9 +15,8 @@
 
 'use strict';
 
-const fs      = require('fs');
-const path    = require('path');
-const esbuild = require('esbuild');
+const path = require('path');
+const { buildBundle } = require('./build-bundle');
 
 const ROOT = path.resolve(__dirname, '..');
 
@@ -59,38 +58,17 @@ const HEADER = [
   '(function () {',
 ].join('\n');
 
-const FOOTER = '})();';
-
-const chunks = PARTS.map((file) => {
-  const fullPath = path.join(ROOT, 'src', 'js', file);
-  if (!fs.existsSync(fullPath)) {
-    throw new Error(`Missing source file: src/js/${file}`);
-  }
-  return fs.readFileSync(fullPath, 'utf8');
-});
-
-// Concatenate inner body directly — each source file preserves its own
-// trailing blank lines so no additional separator is needed.
-const innerBody = chunks.join('');
-
-const unminified = HEADER + '\n' + innerBody + FOOTER + '\n';
-
-const outPath = path.join(ROOT, 'script.js');
-
-// Minify with esbuild (synchronous transform API — no temp files needed).
-const result = esbuild.transformSync(unminified, {
-  minify:       true,
-  // Preserve the leading banner comment so tools can still identify the file.
-  banner:       '/* AI DEATH CLOCK — browser/DOM layer (minified) */',
-  // Target all modern browsers; no transpilation needed.
-  target:       ['es2018'],
-  loader:       'js',
+buildBundle({
+  parts:  PARTS,
+  srcDir: path.join(ROOT, 'src', 'js'),
+  outPath: path.join(ROOT, 'script.js'),
+  loader: 'js',
+  header: HEADER,
+  footer: '})();',
+  esbuildOptions: {
+    // Preserve the leading banner comment so tools can still identify the file.
+    banner: '/* AI DEATH CLOCK — browser/DOM layer (minified) */',
+    // Target all modern browsers; no transpilation needed.
+    target: ['es2018'],
+  },
 });
-
-fs.writeFileSync(outPath, result.code);
-
-const ratio = ((1 - result.code.length / unminified.length) * 100).toFixed(1);
-console.log(
-  `script.js rebuilt from ${PARTS.length} source files ` +
-  `(${unminified.split('\n').length - 1} lines → ${result.code.length} bytes, −${ratio}% via esbuild minification)`,
-);