Feature Request: Auto-complete and Command Recommendation for Amazon Q CLI

### 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 15.4.1 (24E263)

### Expected behaviour

Amazon Q CLI should provide auto-complete functionality and command recommendations as users type, similar to other modern CLI tools. This would help users discover available commands and parameters without needing to reference documentation.

### Actual behaviour

```
[chat-transcript]
> /usage

> /editor

> /issue

I can help you report an issue or make a feature request for Amazon Q. You can use the built-in reporting feature to submit your feedback directly to the development team.

Would you like to:
1. Report a bug or issue you've encountered
2. Request a new feature or enhancement

Could you provide more details about what specific issue you're experiencing or what feature you'd like to request? This will help me create a more detailed report.
[Tool uses: none]

> 2 Request a new feature to have auto complete or command recommendation.

I'll help you submit a feature request for auto-complete or command recommendation functionality in Amazon Q. Let me prepare that for you.
[Tool uses: report_issue]
```

### Steps to reproduce

_No response_

### Environment

```yaml

[q-details]
version = "1.9.1"
hash = "5d2c2807cab9bc6c9dc5fcd05f92c7a979e8a4f7"
date = "2025-04-29T06:22:42.917989Z (15d ago)"
variant = "full"

[system-info]
os = "macOS 15.4.1 (24E263)"
chip = "Apple M1 Pro"
total-cores = 10
memory = "32.00 GB"

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

[env-vars]
PATH = "/Users/USER/.pyenv/shims:/Users/USER/.venv/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:/Users/USER/.venv/bin:/Applications/iTerm.app/Contents/Resources/utilities:/Users/USER/.local/bin"
QTERM_SESSION_ID = "54723b6dde1640c1a8716a5a9b701abe"
Q_SET_PARENT_CHECK = "1"
Q_TERM = "1.9.1"
SHELL = "/bin/zsh"
TERM = "xterm-256color"
__CFBundleIdentifier = "com.googlecode.iterm2"

[chat-settings]
interactive=true

[chat-trusted_tools]

[chat-failed_request_ids]
none

[chat-context]
current_profile=default
profiles=
default

global_context=
.amazonq/rules/**/*.md
README.md
AmazonQ.md

profile_context=none

files=none
```