fix(deps): pin Node 24.22.1 for the October 21, 2026 security release

Node.js 24.14.0 carries CVE-2026-111497 ("Node2Shell"), an out-of-bounds
write in the bundled Brotli decoder that can lead to remote code
execution, plus several high-severity DNS, TLS and URL-parsing fixes.
24.22.1 is the first patched 24.x release.

- Dockerfile: node:24.22.1-slim, digest re-pinned to the multi-arch index
- CI: 24.22.1 in the verify matrix and the other two jobs; the
  allocation-gate requirement now keys on 24.22.1
- Docs: contributor setup and the dependency baseline name 24.22.1

The engines floor and the setup doctor are unchanged.

Co-Authored-By: Claude Sonnet 5.5 <[email protected]>

.github/workflows/ci.yml

@@ -20,10 +20,10 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        node: [24.14.0, 26.x]
+        node: [24.22.1, 26.x]
     env:
       PUPPETEER_SKIP_DOWNLOAD: '1'
-      GEV_REQUIRE_ALLOCATION_GATE: ${{ matrix.node == '24.14.0' && '1' || '0' }}
+      GEV_REQUIRE_ALLOCATION_GATE: ${{ matrix.node == '24.22.1' && '1' || '0' }}
     steps:
       - name: Check out source
         uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4.4.0
@@ -76,7 +76,7 @@ jobs:
       - name: Use Node.js
         uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4.4.0
         with:
-          node-version: 24.14.0
+          node-version: 24.22.1
           cache: npm
 
       - name: Install locked dependencies and headless Chrome
@@ -131,7 +131,7 @@ jobs:
       - name: Use Node.js
         uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4.4.0
         with:
-          node-version: 24.14.0
+          node-version: 24.22.1
           cache: npm
 
       - name: Run the Pinokio install path