[Bug] Excessive CPU usage during idle state in parallel sessions

**Bug Description**
Claude code should not use cpu time idling. I run multiple claude code sessoin in parallel. every one consumes 3% cpu time doing nothin. they should consume no cpu time doing so.

**Environment Info**
- Platform: linux
- Terminal: tmux
- Version: 2.1.270
- Feedback ID: 588c9967-d669-47d3-b320-6f22d69aa176

Tasks: 520 total, 1 running, 519 sleeping, 0 stopped, 0 zombie
%Cpu(s): 2,2 us, 1,3 sy, 0,0 ni, 96,0 id, 0,4 wa, 0,0 hi, 0,0 si, 0,0 st
MiB Mem : 128518,6 total, 24585,8 free, 15944,7 used, 89864,3 buff/cache
MiB Swap: 30517,0 total, 30516,1 free, 0,9 used. 112573,8 avail Mem

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
521863 flo 20 0 1450,4g 264512 144284 S 7,4 0,2 0:02.91 chrome
1832323 root 20 0 28,6g 1,6g 466044 S 3,3 1,3 130:15.89 Xorg
3971231 flo 20 0 1161,7g 323108 111100 S 3,3 0,2 66:54.87 element-desktop
21599 flo 20 0 5582792 473976 120416 S 2,8 0,4 107:09.49 claude
1833334 flo 20 0 729256 75420 51724 S 2,8 0,1 11:17.60 xfce4-terminal
3278834 flo 20 0 5589912 368568 120532 S 2,8 0,3 32:00.54 claude
4088011 flo 20 0 53,0g 576544 312220 S 2,8 0,4 1:18.80 chrome
33462 flo 20 0 5586956 456864 120800 S 2,3 0,3 106:57.58 claude
3278476 flo 20 0 5594060 377732 120672 S 1,9 0,3 31:31.16 claude
3279219 flo 20 0 5589396 345988 120740 S 1,9 0,3 26:05.59 claude
3281622 flo 20 0 5591572 427844 120920 S 1,9 0,3 37:48.05 claude
526124 flo 20 0 1450,2g 109572 82720 S 1,4 0,1 0:00.15 chrome
4088054 flo 20 0 52,5g 147672 117176 S 1,4 0,1 0:45.09 chrome
1267 root 20 0 0 0 0 S 0,9 0,0 55:02.86 nvidia-modeset/kthread_q
4306 flo 20 0 463760 12772 9828 S 0,9 0,0 0:17.80 gvfs-udisks2-vo
518742 flo 20 0 5584556 278364 87952 S 0,9 0,2 0:11.59 claude
526088 flo 20 0 1450,2g 125424 96828 S 0,9 0,1 0:00.30 chrome
2706600 flo 20 0 5591616 309964 64380 S 0,9 0,2 9:23.12 claude
3281875 flo 20 0 5585252 322400 120396 S 0,9 0,2 25:30.21 claude

**Errors**
```json
[]
```