An explicitly stored browser.cloud_provider that names no registered
plugin now raises the honest selection-naming error instead of warning
and silently auto-detecting; the auto-detect walk (including the managed
gateway entitlement probe) runs only when no cloud_provider key was ever
written. The 'nous' selection routes to the Browser Use provider, whose
config resolver is now a strict switch: 'nous' => managed only, stored
vendor => direct BROWSER_USE_API_KEY only with a selection-naming error
when missing. Camofox is selected via browser.cloud_provider: camofox;
CAMOFOX_URL stays the server ADDRESS only and can no longer override an
explicit different selection (never-configured installs keep the legacy
env-var activation).
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