kiro-cli can't read sshd_config

### Checks

- [x] I have searched [github.com/aws/amazon-q-developer-cli/issues](https://github.com/aws/amazon-q-developer-cli/issues?q=) and there are no duplicates of my issue
- [x] I have run `q doctor` in the affected terminal session
- [x] I have run `q restart` and replicated the issue again

### Operating system

Linux 5.10.247-246.989.amzn2int.x86_64 - Amazon Linux 2

### Expected behaviour

Checking my kiro-cli install with kiro-cli doctor, I expected no errors since my /etc/ssh/sshd_config file contains the suggested two lines:

AcceptEnv Q_SET_PARENT
AllowStreamLocalForwarding yes

I have also run sudo systemctl restart sshd, disconnected, and reconnected multiple times.

### Actual behaviour

Stuck in this loop:

dev-dsk-dhughead-1e-f67adea6 % kiro-cli doctor

✘ sshd config: Could not read sshd_config

The /etc/ssh/sshd_config file needs to have the following line:
AcceptEnv Q_SET_PARENT
AllowStreamLocalForwarding yes

If your sshd_config is already configured correctly then:
1. Restart sshd, if using systemd: sudo systemctl restart sshd
2. Disconnect from the remote host
3. Run kiro-cli integrations install ssh on the local machine
4. Reconnect to the remote host and run kiro-cli doctor again

✘ Doctor found errors. Please fix them and try again.

If you are not sure how to fix it, please open an issue with kiro-cli issue to let us know!

### Steps to reproduce

_No response_

### Environment

```yaml

[q-details]
version = "1.23.1"
hash = "faddc2c7ee17078025a62a8dfad6543a4154d2fa"
date = "2025-12-23T23:03:02.919205Z (20d ago)"
variant = "minimal"

[system-info]
chip = "Intel(R) Xeon(R) Platinum 8175M CPU @ 2.50GHz"
total-cores = 8
memory = "61.36 GB"

[system-info.os.linux]
kernel_version = "5.10.247-246.989.amzn2int.x86_64"
id = "amzn"
name = "Amazon Linux"
pretty_name = "Amazon Linux 2"
version_id = "2"
version = "2"
variant = "internal"

[environment]
cwd = "/local/home/USER"
cli-path = "/local/home/USER"
os = "Linux"
shell-path = "/local/home/USER/.toolbox/tools/toolbox/1.1.2513.0/toolbox-exec"
shell-version = "5.8"
install-method = "toolbox"
in-ssh = true

[env-vars]
PATH = "/home/USER/.rbenv/bin:/home/USER/.rbenv/bin:/home/USER/.rbenv/shims:/home/USER/.rbenv/bin:/home/USER/.toolbox/bin:/usr/local/bin:/usr/bin:/home/USER/bin:/usr/local/sbin:/usr/sbin:/home/USER/.local/bin"
Q_SET_PARENT_CHECK = "1"
SHELL = "/bin/zsh"
TERM = "xterm-256color"
```

Start with `kiro-cli doctor` in the reported Amazon Linux 2 SSH session and compare its handling of `/etc/ssh/sshd_config` with the two required lines. Done means the doctor check accepts the configured file after the documented sshd restart, disconnect, reconnect, and SSH integration installation steps.

Written by the indexing model from the issue text.