Replace duplicated full provider catalogs with focused mapping fixtures

• Status: Todo
• Kind: Chore
• Authors: jp
• Date: 2026-08-21
• Label: domain=llm
• Label: package=jp_llm
• Label: type=task

Provider model-list fixtures are too large to review and several model-details cassettes duplicate the full catalog byte for byte. OpenRouter has two identical 29,699-line cassettes plus a 10,111-line model snapshot.

Google, llama.cpp, and Ollama also duplicate their model-list cassette for models and model_details tests.

Acceptance criteria:

• Keep one recorded catalog smoke cassette per provider where live format coverage is useful.
• Test model mapping, sorting, deduplication, deprecation, capability inference, and lookup with small curated static responses.
• Reuse one cassette response for models and model_details when both production methods call the same endpoint.
• Replace full-catalog snapshots with exact assertions over selected representative records and list invariants.
• Keep a test proving an unknown requested model returns the intended fallback.