listed_canonical_providers() read the CANONICAL_PROVIDERS binding
captured in models_catalog_static at import. Every list consumer used to
read hermes_cli.models.CANONICAL_PROVIDERS, so a provider appended there
at runtime vanished from list_available_providers(). It now reads the
models binding again.
The desktop parity contract now covers the listed universe in both
directions: every provider `hermes model` offers is configurable, and an
unlisted pre-release provider appears on neither Providers tab.
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