[BUG] IntelliJ plugin 0.1.14-beta: IDE integration not working on Windows - SSE connection never established

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Plugin shows error notification and IDE integration features don't work, even though Claude Code CLI is installed, in PATH, and runs correctly in terminal. SSE server starts but plugin never connects to it.

What Should Happen?

The plugin should:

1. Successfully connect to the SSE port that Claude Code is listening on
2. Not display false positive error notifications
3. Enable IDE integration features (selection context, diff viewing)

Error Messages/Logs

IntelliJ logs show plugin loading successfully but no connection errors:
  2026-01-08 18:05:36,534 [    548]   INFO - #c.i.i.p.PluginManager - Loaded custom plugins: ... Claude Code [Beta] (0.1.14-beta) ...
  2026-01-08 18:05:55,589 [  19603]   INFO - #o.j.p.t.LocalTerminalDirectRunner - Started com.pty4j.windows.conpty.WinConPtyProcess ... diff_envs={CLAUDE_CODE_SSE_PORT=50150, ENABLE_IDE_INTEGRATION=true, ...}

Steps to Reproduce

Steps to Reproduce:

1. Install Claude Code CLI on Windows, add to PATH
2. Install plugin in IntelliJ, configure explicit path to claude.exe
3. Restart IntelliJ
4. Click Claude Code icon

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.0

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

IntelliJ IDEA terminal

Additional Information

Environment:
Windows 10, IntelliJ IDEA 2025.2, Plugin 0.1.14-beta, Claude Code CLI 2.1.0
Claude in both USER and SYSTEM PATH: C:\Users\<username>\.local\bin\claude.exe
Direct path configured in plugin settings