test(subagent): stabilize DSH SDK background snapshot

examples/jsonrpc-agent/subagent-dsh-sdk-diagnostic.snapshot.cordis.yml

@@ -1,12 +1,23 @@
-# Keyless twin of subagent-dsh-sdk-diagnostic.cordis.yml: include the normal
-# JSON-RPC replay composition, then keep the real DSH SDK child process,
-# provider, and delegation tool.
+# Keyless twin of subagent-dsh-sdk-diagnostic.cordis.yml: keep the real DSH
+# SDK child process/provider/tool and replace only the external parent model.
 - id: base
   name: '@deepseek-ai/cordis-plugin-include'
   config:
-    path: ./cordis.snapshot.yml
+    path: ./cordis.yml
     patches:
+      - id: llm-deepseek
+        name: '@deepseek-ai/dsh-llm-deepseek'
+        disabled: true
       - insert:
+          - id: llm-replay
+            name: '@deepseek-ai/dsh-llm-replay'
+            config:
+              paceMs: 100
+              providers:
+                - id: deepseek-official
+                  name: DeepSeek
+                  models:
+                    - id: deepseek-v4-flash
           - id: subagent-dsh-sdk-diagnostic
             name: '@deepseek-ai/dsh-subagent-dsh-sdk'
             config:

examples/jsonrpc-agent/tests/snapshots/subagent-dsh-sdk-diagnostic/notifications.expected.jsonl

@@ -27,22 +27,25 @@
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 {"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"step/end","seq":26,"time":0,"data":{"turn":1,"step":2}}}}
 {"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"step/start","seq":27,"time":0,"data":{"turn":1,"step":3}}}}
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examples/jsonrpc-agent/tests/snapshots/subagent-dsh-sdk-diagnostic/session.jsonl

@@ -27,21 +27,24 @@
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