chore(ci): add memory CodeQL quality shard

Adds a narrow CodeQL Critical Quality shard for the memory host/runtime boundary.

.github/workflows/codeql-critical-quality.yml

@@ -144,6 +144,27 @@ jobs:
         with:
           category: "/codeql-critical-quality/mcp-process-runtime-boundary"
 
+  memory-runtime-boundary:
+    name: Critical Quality (memory-runtime-boundary)
+    runs-on: blacksmith-4vcpu-ubuntu-2404
+    timeout-minutes: 25
+    steps:
+      - name: Checkout
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
+        with:
+          submodules: false
+
+      - name: Initialize CodeQL
+        uses: github/codeql-action/init@95e58e9a2cdfd71adc6e0353d5c52f41a045d225 # v4
+        with:
+          languages: javascript-typescript
+          config-file: ./.github/codeql/codeql-memory-runtime-boundary-critical-quality.yml
+
+      - name: Analyze
+        uses: github/codeql-action/analyze@95e58e9a2cdfd71adc6e0353d5c52f41a045d225 # v4
+        with:
+          category: "/codeql-critical-quality/memory-runtime-boundary"
+
   ui-control-plane:
     name: Critical Quality (ui-control-plane)
     runs-on: blacksmith-4vcpu-ubuntu-2404