docs: add sample config and verification guide

docs/CONFIG.example.json

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+{
+  "plugins": {
+    "load": {
+      "paths": ["/path/to/WhisperGate/plugin"]
+    },
+    "entries": {
+      "whispergate": {
+        "enabled": true,
+        "config": {
+          "enabled": true,
+          "discordOnly": true,
+          "bypassUserIds": ["561921120408698910"],
+          "endSymbols": ["。", "！", "？", ".", "!", "?"],
+          "noReplyProvider": "openai",
+          "noReplyModel": "whispergate-no-reply-v1"
+        }
+      }
+    }
+  },
+  "models": {
+    "providers": {
+      "openai": {
+        "apiKey": "sk-xxxx",
+        "baseURL": "http://127.0.0.1:8787/v1"
+      }
+    }
+  }
+}

docs/VERIFY.md

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+# WhisperGate Quick Verification
+
+## 1) Start no-reply API
+
+```bash
+cd no-reply-api
+npm start
+```
+
+## 2) Validate API behavior
+
+```bash
+curl -sS http://127.0.0.1:8787/health
+curl -sS -X POST http://127.0.0.1:8787/v1/chat/completions \
+  -H 'Content-Type: application/json' \
+  -d '{"model":"whispergate-no-reply-v1","messages":[{"role":"user","content":"hi"}]}'
+```
+
+Expected assistant text: `NO_REPLY`
+
+## 3) Enable plugin
+
+Set OpenClaw plugin path to `plugin/` and apply `docs/CONFIG.example.json` values.
+
+## 4) Discord logic check
+
+- non-discord session -> normal model
+- discord + bypass user -> normal model
+- discord + non-bypass + ending punctuation -> normal model
+- discord + non-bypass + no ending punctuation -> no-reply model override