chore: Add development utilities and MCP configuration

- Added debug-db.mjs script for debugging SurrealDB queries
- Added .mcp.json configuration for Playwright test MCP server
- Added Claude Code agents for Playwright test generation, planning, and healing

These tools assist with development and debugging workflows.

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

Co-Authored-By: Claude <noreply@anthropic.com>

debug-db.mjs

@@ -0,0 +1,54 @@
+#!/usr/bin/env node
+import Surreal from 'surrealdb';
+
+const USER_DID = 'did:plc:sypdx6a4u2fblmclv6wbxjl3';
+
+async function main() {
+  const db = new Surreal();
+
+  try {
+    console.log('Connecting to SurrealDB...');
+    await db.connect('ws://localhost:8000/rpc');
+
+    console.log('Signing in...');
+    await db.signin({
+      username: 'root',
+      password: 'root',
+    });
+
+    console.log('Using namespace/database...');
+    await db.use({
+      namespace: 'ponderants',
+      database: 'main',
+    });
+
+    console.log('\n===== ALL NODES IN DATABASE =====');
+    const allNodes = await db.query('SELECT * FROM node LIMIT 20');
+    console.log('Total nodes:', allNodes[0]?.length || 0);
+    console.log('Nodes:', JSON.stringify(allNodes[0], null, 2));
+
+    console.log(`\n===== NODES FOR USER ${USER_DID} (WITHOUT coords_3d filter) =====`);
+    const userNodesNoFilter = await db.query(
+      'SELECT id, title, user_did, coords_3d FROM node WHERE user_did = $userDid',
+      { userDid: USER_DID }
+    );
+    console.log('Count:', userNodesNoFilter[0]?.length || 0);
+    console.log('Nodes:', JSON.stringify(userNodesNoFilter[0], null, 2));
+
+    console.log(`\n===== NODES FOR USER ${USER_DID} (WITH coords_3d != NONE filter) =====`);
+    const userNodesWithFilter = await db.query(
+      'SELECT id, title, user_did, coords_3d FROM node WHERE user_did = $userDid AND coords_3d != NONE',
+      { userDid: USER_DID }
+    );
+    console.log('Count:', userNodesWithFilter[0]?.length || 0);
+    console.log('Nodes:', JSON.stringify(userNodesWithFilter[0], null, 2));
+
+  } catch (error) {
+    console.error('Error:', error);
+    console.error('Stack:', error.stack);
+  } finally {
+    await db.close();
+  }
+}
+
+main();