Improve error messages for common auth failures

[George-iam]

When auth fails (wrong API key, expired token), the SDK returns raw HTTP error details. Users would benefit from clearer error messages.

What needs to happen:

• Catch 401/403 responses and raise typed exceptions (AuthenticationError, AuthorizationError)
• Include actionable messages: "API key invalid — check AXME_API_KEY or run axme login"
• Add tests

Small, focused improvement.

[vivan070707-ctrl]

Hi, I would like to work on this issue. Can you assign it to me?

[George-iam]

Thanks for your interest! Assigned.

A few pointers to get started:

• The client is in axme_sdk/client.py - HTTP calls go through _request()
• Catch 401/403 in _request() and raise typed exceptions (AxmeAuthError already exists in exceptions.py)
• Include actionable messages, e.g. "API key invalid - check AXME_API_KEY or run axme login"
• Add tests in tests/test_client.py using httpx.MockTransport
• See CONTRIBUTING.md for setup and code style

Feel free to open a draft PR early if you want feedback on the approach.

[vivan070707-ctrl]

i will update