User on Discord reported our docs saying ANTHROPIC_API_KEY is required.
It's not — hermes-agent supports Anthropic, OpenAI, OpenRouter (incl. free
models), Google, local Ollama/LM Studio, etc. Users only need the key for
the provider they actually picked in `hermes setup`.
Also replaced the 'pip install hermes-agent' references that snuck in — the
package isn't on PyPI, it installs from source via Nous's official script.
Changes:
- .env.example: list all common provider keys, all commented out, users
uncomment whichever they use
- docker-compose.yml: pass through ANTHROPIC / OPENAI / OPENROUTER / GOOGLE /
GROQ / MISTRAL keys (all optional, whichever is set wins)
- README.md: remove 'ANTHROPIC_API_KEY required' claim, replace pip install
references with the Nous installer path, generalize Docker troubleshooting
to match any provider
- FEATURES-INVENTORY.md: list all supported provider env vars
