Provider discovery imports every bundled plugin's __init__, and it runs in
interpreters without the app's HTTP stack: PM's runtime calls
lazy_installs_allowed() -> hermes_cli.config, whose import-time
_inject_profile_env_vars() lists providers. solstice/__init__ imported
transport.py at the top, which pulls agent.gemini_native_adapter -> httpx,
so every install logged "Failed to load bundled provider plugin solstice:
No module named 'httpx'" and solstice went unregistered in that process.
INFERENCE_BASE_URL now lives in __init__ and SolsticeClient is imported
inside create_client, matching the other provider plugins.
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