Autocomplete in iTerm2 now working

### 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 15.6.1 (24G90)

### Expected behaviour

My iTerm2 should display autocomplete of git or brew or npm.

### Actual behaviour

My iTerm2 has no autocomplete by Amazon Q.

### Steps to reproduce

_No response_

### Environment

```yaml

[q-details]
version = "1.16.0"
hash = "34986d95f660e2bce63189f1179de4a110507fe7"
date = "2025-09-16T21:59:28.134585Z (4h ago)"
variant = "full"

[system-info]
os = "macOS 15.6.1 (24G90)"
chip = "Apple M2"
total-cores = 8
memory = "16.00 GB"

[environment]
cwd = "/Users/USER/Documents/dtac/unify-web"
cli-path = "/Users/USER/Documents/dtac/unify-web"
os = "Mac"
shell-path = "/bin/zsh"
shell-version = "5.9"
terminal = "iTerm 2"
install-method = "unknown"

[env-vars]
PATH = "/Users/USER/.codeium/windsurf/bin:/Users/USER/.jenv/shims:/Users/USER/.jenv/bin:/Users/USER/.pyenv/shims:/Users/USER/Documents/dtac/omx/api/bin:/Users/USER/.nvm/versions/node/v22.17.1/bin:/Library/Frameworks/Python.framework/Versions/2.7/bin:/opt/homebrew/bin:/opt/homebrew/sbin:/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:/usr/local/go/bin:/Applications/iTerm.app/Contents/Resources/utilities:/Users/USER/.local/bin"
QTERM_SESSION_ID = "95873662f33d4508adc84311a343e5e7"
Q_SET_PARENT_CHECK = "1"
Q_TERM = "1.16.0"
SHELL = "/bin/zsh"
TERM = "xterm-256color"
__CFBundleIdentifier = "com.googlecode.iterm2"
```

No se han identificado archivos, pruebas ni puntos de entrada de código. Empieza reproduciendo el autocompletado ausente en iTerm2 con las versiones indicadas de macOS, zsh y Amazon Q, y compara después el comportamiento de la integración del shell con un terminal que funcione; se considera terminado cuando el autocompletado funciona para git, brew o npm.

Escrito por el modelo de indexación a partir del texto del issue.