Authentication failed

### 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

macOS 26.4.0 (25E246)

### Expected behaviour

kiro-cli doctor

✔ Everything looks good!

Kiro CLI still not working? Run kiro-cli issue to let us know!

### Actual behaviour

kiro-cli doctor

✔ Everything looks good!

Kiro CLI still not working? Run kiro-cli issue to let us know!

kiro-cli doctor

✔ Everything looks good!

Kiro CLI still not working? Run kiro-cli issue to let us know!

### Steps to reproduce

_No response_

### Environment

```yaml

[q-details]
version = "1.28.1"
hash = "fc92565d6f51c1708e92500b2b2bcc4a424f5705"
date = "2026-03-21T05:23:50.031438Z (5d ago)"
variant = "full"

[system-info]
os = "macOS 26.4.0 (25E246)"
chip = "Apple M2 Pro"
total-cores = 10
memory = "16.00 GB"

[environment]
cwd = "/Users/USER/repos/fbase/python/fbase_inspector"
cli-path = "/Users/USER/repos/fbase/python/fbase_inspector"
os = "Mac"
shell-path = "/bin/zsh"
shell-version = "5.9"
terminal = "macOS"
install-method = "unknown"

[env-vars]
PATH = "/Users/USER/.nvm/versions/node/v22.21.1/bin:/Users/USER/.antigravity/antigravity/bin:/Users/USER/pgsql/build/17.7/bin:/opt/homebrew/bin:/Library/Frameworks/Python.framework/Versions/3.13/bin:/usr/local/bin:/System/Cryptexes/App/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/local/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/appleinternal/bin:/opt/pkg/env/active/bin:/opt/pmk/env/global/bin:/Library/Apple/usr/bin:/Applications/Wireshark.app/Contents/MacOS:/Applications/VMware Fusion Pro 13.6.2 Build 24409261.app/Contents/Public:/usr/local/go/bin:/Users/USER/.local/bin:.:/Users/USER/gopath/bin"
QTERM_SESSION_ID = "396d9385a8db496cb60dfcf4b712ec0f"
Q_SET_PARENT_CHECK = "1"
Q_TERM = "1.28.1"
SHELL = "/bin/zsh"
TERM = "xterm-256color"
__CFBundleIdentifier = "com.apple.Terminal"
```

Es sind keine Quelldatei, kein Test und keine reproduzierbaren Schritte angegeben. Führe zunächst `q doctor` und `q restart` in der gemeldeten macOS-Umgebung aus und ermittle dann, welcher Authentifizierungsfehler trotz der erfolgreichen doctor-Ausgabe auftritt. Als abgeschlossen gilt die Aufgabe, wenn ein bestätigtes Fehlerszenario und eine klare Erklärung oder Behebung dafür vorliegen.

Vom Indexierungsmodell aus dem Issue-Text verfasst.