Returns a mapping with a ``models`` list (name, size, family, parameters),
or an ``error`` string if Ollama cannot be reached.

Returns a mapping of category name to its description and probe metadata
(id, description, whether it installs a system prompt, and its fail
markers), or an ``error`` string if the probe library is invalid.

Args:
    model: Name of an installed Ollama model (see ``list_models``).
    category: A probe category name (see ``list_probes``).

Returns:
    A report dict (model, scope, summary, per-probe results), or an
    ``error`` string if the category is unknown or the library is invalid.

No fail markers are defined for an ad-hoc prompt, so the verdict will be
``pass`` only if the model clearly refuses, and ``needs_review`` otherwise.

Args:
    model: Name of an installed Ollama model (see ``list_models``).
    prompt: The single prompt to send.

Returns:
    A report dict with one result, or an ``error`` string on failure.

Returns:
    A mapping with the written ``json`` and ``markdown`` file paths, or an
    ``error`` string if no run has been performed yet this session.