[BUG] Claude Code background processes continue consuming tokens after disconnection

Bug Report: Claude Code background processes continue consuming tokens
after disconnection

Description:
Claude Code enhancement processes continued running and consuming API
tokens for 17+ hours after I disconnected from the session.

Details:

• Started enhancement operations in Claude Code
• Disconnected/closed Claude Code interface during operation
• Background Python processes continued running
• Consumed ~117K tokens ($2) over 17+ hours while "disconnected"
• Had to manually kill processes to stop token consumption

Expected behavior:
Claude Code should terminate background processes when session ends or
user disconnects.

Actual behavior:
Enhancement processes continue indefinitely, consuming tokens without
user awareness.

Impact:
Potential for significant unexpected charges if not caught quickly.

Environment:

• macOS
• Claude Code CLI