Auto Load user preferences when starting up 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 15.6.1 (24G90)

### Expected behaviour

while there are some small preferences which i feel if q adapts that would useful for my development needs, like setting some folder path using specific python interpreter for all my packages using this specific java version for running my java tests, refer to this specific context folder for any of the query related to that custom knowledge base

### Actual behaviour

every time i had to feed it so it can adapt to my needs, it will be useful if its adapting as per the settings in preference file

### Steps to reproduce

_No response_

### Environment

```yaml

[q-details]
version = "1.15.0"
hash = "a8a0426eaff32ac9b1599ca1b1f1881ffd16054d"
date = "2025-09-02T17:15:25.464923Z (9d ago)"

[system-info]
os = "macOS 15.6.1 (24G90)"
chip = "Apple M1 Pro"
total-cores = 10
memory = "32.00 GB"

[environment]
install-method = "unknown"

[env-vars]

QTERM_SESSION_ID = "2c49eecb50d14e52bc52d8c20422c1cf"
Q_SET_PARENT_CHECK = "1"
Q_TERM = "1.15.0"
SHELL = "/bin/zsh"
TERM = "xterm-256color"
ZDOTDIR = "/Users/USER"
__CFBundleIdentifier = "com.microsoft.VSCode"
```

Die Anfrage erwähnt den Q CLI-Start, eine Einstellungsdatei sowie die Befehle q doctor und q restart, nennt aber keine Quelldateien oder Tests. Beginne damit, das Laden der Einstellungen und den Einstiegspunkt beim Start zu finden, und ermittle anschließend, wie q restart das Verhalten überprüfen kann. Erledigt ist die Aufgabe, wenn unterstützte Einstellungen automatisch für eine neue Sitzung geladen werden und Tests das erwartete Verhalten dokumentieren.

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