feat(examples): default agent configs to DeepSeek Pro Max Thinking

examples/acp-agent/fs.cordis.snapshot.yml

@@ -1,6 +1,9 @@
 # Keyless filesystem snapshots apply the spill and replay overlays directly
 # because include patches cannot target entries behind a nested include. The
-# sandboxed filesystem stack already lives in the base cordis.yml.
+# sandboxed filesystem stack already lives in the base cordis.yml. This file also
+# re-pins the acp-agent model to `deepseek-v4-flash`: `cordis.yml` ships
+# `deepseek-v4-pro`, but the recorded corpus was captured on flash, and a config
+# patch replaces the whole app config, so the base fields are restated verbatim.
 - id: base
   name: '@cordisjs/plugin-include'
   config:
@@ -9,6 +12,18 @@
       - id: llm-deepseek
         name: '@deepseek-ai/dsh-llm-deepseek'
         disabled: true
+      - id: acp-agent
+        name: '@deepseek-ai/dsh-acp-demo'
+        config:
+          provider: deepseek
+          model: deepseek-v4-flash
+          persistenceRoot: !!js process.env.DSH_SNAPSHOT_SESSIONS_ROOT ?? './.sessions'
+          workspaceContext:
+            maxBytes: 65536
+          persona: |
+            You are a coding assistant powered by the {{model}} model. Your working directory is {{cwd}}. Your bash tool runs under a file sandbox — a `[sandbox: file access denied …]` result is policy, not a command bug.
+
+            Verify your work by running the code or tests. Keep answers brief and factual.
       - insert:
           - id: spill-local
             name: '@deepseek-ai/dsh-spill-local'