feat(leak-hunt): improve WhatsApp Web hunts

Summary:
Teaches the memlab `leak-hunt` skill to drive WhatsApp Web from its pre-built navigation graph instead of a blind screenshot/accessibility walk, and bumps the MCP server version stamp (server code unchanged).

- MCP server: version bump only. `memlab/mcp-server` package.json 2.18.2 → 2.18.3 and the self-reported `version` in `src/index.ts` 2.18.1 → 2.18.3, which also resolves a pre-existing mismatch between the two. No server behavior change — the stamp follows the release convention.

Differential Revision: D111816123

fbshipit-source-id: 451370d77a9580186f7edd17a56703d2fdb76827

Author: JacksonGL

packages/mcp-server/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@memlab/mcp-server",
-  "version": "2.18.2",
+  "version": "2.18.3",
   "license": "MIT",
   "description": "MCP server for MemLab heap snapshot analysis — gives AI coding assistants tools to explore JavaScript heap snapshots, find memory leaks, and identify optimization opportunities",
   "author": "Liang Gong <lgong@meta.com>",

packages/mcp-server/src/index.ts

@@ -74,7 +74,7 @@ import {registerEventRegistry} from './tools/event-registry.js';
 
 const server = new McpServer({
   name: 'memlab',
-  version: '2.18.1', // keep in sync with package.json
+  version: '2.18.3', // keep in sync with package.json
 });
 
 // Wrap every tool with a wall-clock guardrail (default 90s, override per-call