The delegation imported ``plugins.model_providers.deepseek`` — the only cross-plugin
module import in the tree, and one that resolves solely through the loader's
sys.modules shim (popped again if the deepseek plugin fails to load). Look the
profile up with get_provider_profile("deepseek") instead: already imported from
``providers``, honours a user override of the profile, degrades to the base no-op
without a try/except.
Drop the ``len(m) <= len("deepseek/")`` guard — the native profile returns
({}, {}) for an empty id anyway. Bind the expected value in the parity test and
assert it is non-empty so the equality cannot pass as ({}, {}) == ({}, {}).
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