fix: v2.5.2 — plugin bootstrap exports before it runs (v2.5.1 update crash)

v2.5.1's update died at "bootstrap" on every platform: boot.npmCommand is
not a function. Run as the entry, plugin-bootstrap.js calls bootstrap() →
plugin-open.js, which requires plugin-bootstrap back and got the module.exports
of that moment — {} — because it was assigned at the bottom, below the entry
block. plugin-open.js already exported first for the same reason.

- module.exports moved above the entry block in plugin-bootstrap.js
- A test checks both entry scripts assign module.exports before their entry
  block (it fails on v2.5.1's file); requiring the module, as the other tests
  do, never takes the entry path

openapi.yaml

@@ -3,7 +3,7 @@
 openapi: 3.0.3
 info:
   title: Agent Dashboard for Claude Code API
-  version: 2.5.1
+  version: 2.5.2
   description: HTTP API for real-time Claude Code session monitoring, agent lifecycle tracking, analytics, pricing, hooks ingestion, and workflow intelligence.
   contact:
     name: Nguyễn Ngọc Trí Vĩ