chore(TODO): record declared LLM test coverage as the follow-up to #240

[luca-belli]

Adds one TODO item, the follow-up discussed on #240.

What it records: replace test_coverage.py's class-name → test-file mapping with a declared one. Each TestLLMBase subclass sets llm_class = ..., and the coverage checks compare those declarations against the discovered clients. That deletes:

• the name-conversion helper from fix(test): derive LLM test file names from one helper in test_coverage #240,
• the AST inheritance parsing,
• the silent if test_file_path.exists() skips.

It also turns the "informational for now" inheritance check into a hard requirement.

Why it's a TODO and not a PR: upstream it's about 1–2 hours. But forks whose client tests don't subclass TestLLMBase will fail CI after syncing until they migrate, so forks should get notice before it lands.

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