Agents: add per-agent defaults and safe model fallback (#51974)

* Agents: add per-agent defaults and safe model fallback

* Docs: add per-agent thinking/reasoning/fast defaults to config reference and thinking docs

* Format get-reply directives

* Auto-reply: guard agent reasoning defaults

* Docs: update config baseline

docs/gateway/configuration-examples.md

@@ -303,6 +303,20 @@ Save to `~/.openclaw/openclaw.json` and you can DM the bot from that number.
         },
       },
     },
+    list: [
+      {
+        id: "main",
+        default: true,
+        thinkingDefault: "high", // per-agent thinking override
+        reasoningDefault: "on", // per-agent reasoning visibility
+        fastModeDefault: false, // per-agent fast mode
+      },
+      {
+        id: "quick",
+        fastModeDefault: true, // this agent always runs fast
+        thinkingDefault: "off",
+      },
+    ],
   },
 
   tools: {