refactor(whatsapp): replace bridge with neonize

docs/chat-apps.md

@@ -303,9 +303,15 @@ nanobot gateway
 <details>
 <summary><b>WhatsApp</b></summary>
 
-Requires **Node.js ≥18**.
+Requires the WhatsApp optional dependencies:
 
-**1. Link device**
+```bash
+pip install "nanobot-ai[whatsapp]"
+# Source checkout:
+python -m pip install -e ".[whatsapp]"
+```
+
+**1. Link device with QR**
 
 ```bash
 nanobot channels login whatsapp
@@ -319,30 +325,35 @@ nanobot channels login whatsapp
   "channels": {
     "whatsapp": {
       "enabled": true,
-      "allowFrom": ["+1234567890"]
+      "allowFrom": ["1234567890"]
     }
   }
 }
 ```
 
-**3. Run** (two terminals)
+Optional session database path:
 
-```bash
-# Terminal 1
-nanobot channels login whatsapp
-
-# Terminal 2
-nanobot gateway
+```json
+{
+  "channels": {
+    "whatsapp": {
+      "databasePath": "~/.nanobot/whatsapp-auth/neonize.db"
+    }
+  }
+}
 ```
 
-> WhatsApp bridge updates are not applied automatically for existing installations. After upgrading nanobot, rebuild the local bridge with:
-> `rm -rf ~/.nanobot/bridge && nanobot channels login whatsapp`
+**3. Run**
+
+```bash
+nanobot gateway
+```
 
 **Optional: static LID mappings**
 
 Modern WhatsApp can deliver a sender's LID instead of their phone number. nanobot
-learns the LID→phone mapping at runtime (and reuses the ones the bridge persists on
-disk), but you can also seed mappings up front so the phone number resolves from the
+learns LID to phone mappings at runtime when both identifiers are present, but you
+can also seed mappings up front so the phone number resolves from the
 very first message:
 
 ```json
@@ -350,7 +361,7 @@ very first message:
   "channels": {
     "whatsapp": {
       "enabled": true,
-      "allowFrom": ["+1234567890"],
+      "allowFrom": ["1234567890"],
       "lidMappings": { "123456789012345": "1234567890" }
     }
   }

docs/quick-start.md

@@ -326,11 +326,10 @@ python -m pip install -e .
 nanobot --version
 ```
 
-If you use WhatsApp, rebuild the local bridge after upgrading:
+If you use WhatsApp from a source checkout, keep the optional dependencies installed:
 
 ```bash
-rm -rf ~/.nanobot/bridge
-nanobot channels login whatsapp
+python -m pip install -e ".[whatsapp]"
 ```
 
 ## First-Run Troubleshooting