github authenticated non enterprise user requires profileArn

### 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 26.2.0 (25C56)

### Expected behaviour

I am able to use Kiro-cli post authentication.

### Actual behaviour

Currently I am unable to use Kiro-cli post authentication due to the following error:

```shell
Kiro is having trouble responding right now:
0: Failed to send the request: An unknown error occurred: profileArn is required but no profiles are available. Please log in and select a profile.
1: An unknown error occurred: profileArn is required but no profiles are available. Please log in and select a profile.

Location:
crates/chat-cli/src/cli/chat/mod.rs:1647

Backtrace omitted. Run with RUST_BACKTRACE=1 environment variable to display it.
Run with RUST_BACKTRACE=full to include source snippets.
```

Notably, the IDE works as expected. Some key details:

- GitHub-authenticated (non-enterprise) user
- kiro-cli whoami works fine
- kiro-cli chat fails with profileArn is required but no profiles are available
- The IDE works perfectly with the same account
- The IDE stores the profile at ~/Library/Application Support/Kiro/User/globalStorage/kiro.kiroagent/profile.json but the CLI never populates an equivalent

### Steps to reproduce

Log in using GitHub SSO as a non enterprise user. The CLI should throw the listed response.

I am receiving this error after re-authentication, trying to doctor, and reinstalling the cli.

### Environment

```yaml

[q-details]
version = "1.28.2"
hash = "27868a6e6508e32a80d15e6eba2f6adbab6c2aa7"
date = "2026-03-27T00:14:48.847531Z (23h ago)"
variant = "full"

[system-info]
os = "macOS 26.2.0 (25C56)"
chip = "Apple M4 Pro"
total-cores = 12
memory = "48.00 GB"

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

[env-vars]
PATH = "/Users/USER/.nvm/versions/node/v24.12.0/bin:/Users/USER/.local/bin:/opt/homebrew/opt/openjdk/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:/opt/pmk/env/global/bin:/Users/USER/.cargo/bin:/Users/USER/.local/bin:/Users/USER/Library/Application Support/JetBrains/Toolbox/scripts"
QTERM_SESSION_ID = "9d7de98f5d3042a1b0ce438249fd8895"
Q_SET_PARENT_CHECK = "1"
Q_TERM = "1.28.2"
SHELL = "/bin/zsh"
TERM = "xterm-256color"
__CFBundleIdentifier = "com.apple.Terminal"
```