Configured Ollaman and improved llm config functionality: now the default is ollama, the fallback is gemini 2.5 flash lite, and these can be changed modifying just on line in the yaml config file

feat: Add livelli_idrometrici task with unified adapter-level caching

feat: remove mode parameter from OMIRL tool - implement direct task-based routing

feat: Complete OMIRL Phase 1 refactor - YAML-based validation architecture