[WIP] Fix AL workflow routing logic

[Copilot]

• Fix fallback.py docstring to accurately describe return value
• Change "TO DO" to "TODO" in fallback.py
• Fix potential IndexError in agent_host.py when accessing empty messages list
• Update context_builder.py docstring to match actual return type
• Implement lazy initialization for LLM in parafraseo.py
• Implement lazy initialization for LLM in fallback.py
• Refactor fallback.py to use lazy LLM initialization (class-based approach implemented via _get_llm() pattern)
• Fix potential IndexError in guard_inicial.py when accessing empty messages list
• Implement lazy initialization for LLM in context_builder.py

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