build: lower the Node engines floor to 22.18

.github/workflows/ci.yml

@@ -95,13 +95,13 @@ jobs:
 
   node-compat:
     runs-on: ubuntu-latest
-    name: node 26
+    name: node ${{ matrix.node }}
     env:
       DSH_GATE_CONCURRENCY: '2'
     strategy:
       fail-fast: false
       matrix:
-        node: [26]
+        node: ['22.18', 24, 26]
     steps:
       - uses: actions/checkout@v6
 

.github/workflows/e2e.yml

@@ -49,6 +49,17 @@ permissions:
 jobs:
   e2e:
     runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        # The keyless ci.yml matrix runs the MOCK adapter (dsh-llm-replay); the
+        # real fetch + SSE-streaming adapter path runs ONLY here, so its
+        # node-version compat is covered nowhere else. Run the real-API suite on
+        # the engines floor AND the primary line to close that gap. 26 is left to
+        # the keyless matrix — floor + LTS is the meaningful pair for the live
+        # network path, and inference is cheap (we are DeepSeek).
+        node: ['22.18', 24]
+    name: e2e node ${{ matrix.node }}
     # Run on every trusted event. Skip untrusted PRs (forks + Dependabot) where
     # the secret is withheld — they would otherwise hard-fail the preflight.
     if: >-
@@ -62,7 +73,7 @@ jobs:
 
       - uses: actions/setup-node@v6
         with:
-          node-version: 24
+          node-version: ${{ matrix.node }}
 
       - name: Enable corepack (pnpm)
         run: corepack enable