feat: consolidate docs, backend/session infra, and settings updates

docs/user-facing/downloads/agentic-writer-local-backend/get-local-ip.sh

@@ -0,0 +1,34 @@
+#!/bin/bash
+
+echo "Detecting your local IP address..."
+echo ""
+
+# Detect local IP based on OS
+if [[ "$OSTYPE" == "darwin"* ]]; then
+    # macOS - try en0 (WiFi) then en1 (Ethernet)
+    IP=$(ipconfig getifaddr en0 2>/dev/null || ipconfig getifaddr en1 2>/dev/null || echo "")
+    INTERFACE=$(ifconfig en0 &>/dev/null && echo "en0 (WiFi)" || echo "en1 (Ethernet)")
+elif [[ "$OSTYPE" == "linux-gnu"* ]]; then
+    # Linux
+    IP=$(ip route get 1 | awk '{print $7;exit}' 2>/dev/null || hostname -I | awk '{print $1}')
+    INTERFACE="default"
+else
+    # Windows or unknown
+    IP=$(hostname -I 2>/dev/null | awk '{print $1}' || echo "")
+    INTERFACE="unknown"
+fi
+
+if [ -z "$IP" ]; then
+    echo "❌ Could not detect IP address automatically"
+    echo ""
+    echo "Manual detection:"
+    echo "  macOS:   ipconfig getifaddr en0"
+    echo "  Linux:   ip route get 1 | awk '{print \$7}'"
+    echo "  Windows: ipconfig (look for IPv4 Address)"
+    exit 1
+fi
+
+echo "✅ Your local IP: $IP ($INTERFACE)"
+echo ""
+echo "Use this in your plugin settings:"
+echo "  Base URL: http://$IP:8080"