feat(pi): add opencode cli setup script

scripts/setup-opencode-pi.sh

@@ -0,0 +1,65 @@
+#!/bin/bash
+set -e
+
+# Colors
+GREEN='\033[0;32m'
+BLUE='\033[0;34m'
+YELLOW='\033[0;33m'
+NC='\033[0m'
+
+echo -e "${BLUE}=== Opencode CLI Setup for Raspberry Pi ===${NC}"
+
+# 1. Install Opencode CLI
+if ! command -v opencode &> /dev/null; then
+    echo -e "${GREEN}[1/3] Installing @opencode-ai/cli globally...${NC}"
+    npm install -g @opencode-ai/cli
+else
+    echo -e "${GREEN}[1/3] Opencode CLI already installed.${NC}"
+fi
+
+# 2. Configure Opencode
+CONFIG_DIR="$HOME/.config/opencode"
+CONFIG_FILE="$CONFIG_DIR/opencode.json"
+
+mkdir -p "$CONFIG_DIR"
+
+if [ ! -f "$CONFIG_FILE" ]; then
+    echo -e "${GREEN}[2/3] Creating opencode.json...${NC}"
+    cat <<EOF > "$CONFIG_FILE"
+{
+  "\$schema": "https://opencode.ai/config.json",
+  "plugin": ["opencode-antigravity-auth@latest"],
+  "provider": {
+    "google": {
+      "models": {
+        "antigravity-gemini-3-pro": {
+          "name": "Gemini 3 Pro (Antigravity)",
+          "limit": { "context": 1048576, "output": 65535 },
+          "modalities": { "input": ["text", "image", "pdf"], "output": ["text"] },
+          "variants": {
+            "low": { "thinkingLevel": "low" },
+            "high": { "thinkingLevel": "high" }
+          }
+        }
+      }
+    }
+  }
+}
+EOF
+    echo "Configuration created at $CONFIG_FILE"
+else
+    echo -e "${YELLOW}[2/3] opencode.json already exists. Skipping overwrite.${NC}"
+    echo "Make sure 'opencode-antigravity-auth@latest' is in your 'plugin' list."
+fi
+
+# 3. Auth Instructions
+echo -e "${BLUE}=== Authentication Required ===${NC}"
+echo -e "${YELLOW}Since you are on a headless Pi, you need to use SSH port forwarding for the OAuth callback.${NC}"
+echo ""
+echo "1. On your LOCAL machine (laptop), run:"
+echo "   ssh -L 51121:localhost:51121 pi@<YOUR_PI_IP>"
+echo ""
+echo "2. On the PI (this terminal), run:"
+echo "   opencode auth login"
+echo ""
+echo "3. Open the URL in your local browser. The callback will be forwarded to the Pi."