BUZZ_PRIVATE_KEY from hermes .env is not being used ?

**Describe the bug**
I have setup BUZZ_PRIVATE_KEY in .env of the hermes setup and I have setup couple agents in buzz to use hermes as harness and model provider. the agent keeps saying auth error: BUZZ_PRIVATE_KEY is required and wants me to set private key as environment variable.

**Expected behavior**
I expect the agent to use private key from the hermes .env file and be able to use model from hermes.

**Version and platform**
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- Buzz version: 0.5.14
- OS: macOS Tahoe 26.6.1

**Logs / additional context**
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