Add wp-env configuration for local development

Add .wp-env.json to standardize local development environment with:
- PHP 7.4 (plugin minimum)
- Latest WordPress (auto-updates)
- Query Monitor auto-installed
- Debug constants enabled
- Test environment with PHP 8.4 + WordPress trunk

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: GaryJones

.wp-env.json

@@ -0,0 +1,20 @@
+{
+  "plugins": [
+    "."
+  ],
+  "phpVersion": "7.4",
+  "config": {
+    "WP_DEBUG": true,
+    "WP_DEBUG_LOG": true,
+    "SCRIPT_DEBUG": true
+  },
+  "lifecycleScripts": {
+    "afterStart": "wp-env run cli wp plugin install query-monitor --activate"
+  },
+  "env": {
+    "tests": {
+      "phpVersion": "8.4",
+      "core": "WordPress/WordPress#trunk"
+    }
+  }
+}