Defensive tests for the surface area that user-facing voice commands hit.
llm::parse_backend (5 new tests)
- English aliases ("groq", "ollama", "cloud", "local")
- Russian aliases ("облако", "локальный", "локал")
- Case insensitivity ("OLLAMA", " Groq ")
- Rejects unknown ("openai", "claude", "")
- current_backend_name() smoke test
macros (2 new tests)
- Store JSON round-trip with multiple macros
- is_macro_control case-handling (noun form NOT recognised, verb form IS)
Tests: 62/62 (was 55).
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