test(contract): pin Hermes v2026.8.13 host

Author: offendingcommit

.github/workflows/test.yml

@@ -25,7 +25,7 @@ jobs:
       - uses: actions/checkout@v6
         with:
           repository: offendingcommit/hermes-agent
-          ref: 9b117cc70919ff5db4bba85ee374b562ae202931
+          ref: d3b1cfe9a80531e0682b1e66752e04cea29d5d4a
           path: .hermes-agent-deployed
       - uses: astral-sh/setup-uv@v8.2.0
         with:
@@ -36,7 +36,7 @@ jobs:
           HERMES_AGENT_PATH: ${{ github.workspace }}/.hermes-agent-deployed
         run: |
           test "$(git -C "$HERMES_AGENT_PATH" rev-parse HEAD)" = \
-            "9b117cc70919ff5db4bba85ee374b562ae202931"
+            "d3b1cfe9a80531e0682b1e66752e04cea29d5d4a"
           uv run python -m unittest tests.test_context_engine_contract -v
 
   # Track forward drift against upstream main without making Amber depend on