chore: add "just sim-update" command

Updates the iOS simulators to the latest version in XCode

justfile

@@ -47,6 +47,41 @@ set-version new_version:
 clean:
     xcodebuild -project Forji/Forji.xcodeproj -scheme Forji clean 2>&1 | xcbeautify
 
+# Create simulators for justfile destinations on the latest installed iOS runtime
+sim-update:
+    #!/usr/bin/env bash
+    set -eo pipefail
+    DEVICES=("iPhone 17 Pro" "iPhone Air" "iPhone 17 Pro Max")
+    LATEST=$(xcrun simctl list runtimes -j | jq '[.runtimes[] | select(.platform == "iOS" and .isAvailable)] | sort_by(.version | split(".") | map(tonumber)) | last')
+    if [ -z "$LATEST" ] || [ "$LATEST" = "null" ]; then
+      echo "No iOS simulator runtime found. Install one in Xcode → Settings → Platforms."
+      exit 1
+    fi
+    LATEST_VERSION=$(echo "$LATEST" | jq -r '.version')
+    LATEST_IDENTIFIER=$(echo "$LATEST" | jq -r '.identifier')
+    echo "Latest iOS runtime: $LATEST_VERSION ($LATEST_IDENTIFIER)"
+    EXISTING=$(xcodebuild -project Forji/Forji.xcodeproj -scheme Forji -showdestinations 2>&1 || true)
+    CREATED=0
+    for DEVICE in "${DEVICES[@]}"; do
+      if echo "$EXISTING" | grep -E "OS:${LATEST_VERSION//./\\.},.*name:${DEVICE} \}" >/dev/null; then
+        echo "  ✓ $DEVICE already exists on $LATEST_VERSION"
+      else
+        DEVICE_TYPE_ID=$(xcrun simctl list devicetypes -j | jq -r --arg n "$DEVICE" '.devicetypes[] | select(.name == $n) | .identifier')
+        if [ -z "$DEVICE_TYPE_ID" ]; then
+          echo "  ✗ Device type not found: $DEVICE (skipping)"
+          continue
+        fi
+        echo "  → Creating $DEVICE on $LATEST_VERSION..."
+        xcrun simctl create "$DEVICE" "$DEVICE_TYPE_ID" "$LATEST_IDENTIFIER" >/dev/null
+        CREATED=$((CREATED + 1))
+      fi
+    done
+    if [ "$CREATED" -gt 0 ]; then
+      echo "Created $CREATED simulator(s)."
+    else
+      echo "All simulators are up to date."
+    fi
+
 # Build, install, and launch in simulator
 run destination=default_destination:
     #!/usr/bin/env bash