spark: add JSON validator utility with test files

wizard-work/spark/json-validator.sh

@@ -0,0 +1,25 @@
+#!/bin/bash
+# Simple JSON validator using jq
+# Returns 0 if valid JSON, 1 if invalid
+
+validate_json() {
+    local file="$1"
+    if [[ ! -f "$file" ]]; then
+        echo "Error: File '$file' not found" >&2
+        return 1
+    fi
+    if jq empty "$file" 2>/dev/null; then
+        echo "Valid JSON: $file"
+        return 0
+    else
+        echo "Invalid JSON: $file" >&2
+        return 1
+    fi
+}
+
+if [[ $# -eq 0 ]]; then
+    echo "Usage: $0 <json-file>" >&2
+    exit 1
+fi
+
+validate_json "$1"

wizard-work/spark/test-invalid.json

@@ -0,0 +1,4 @@
+{
+  "name": "invalid",
+  missing_quotes: true
+}

wizard-work/spark/test-valid.json

@@ -0,0 +1,5 @@
+{
+  "name": "test",
+  "valid": true,
+  "count": 42
+}