Include simplified llm prompting, tts reformatting, and history

[ShaohongZ]

Adds a simplified LLM plugin and action stack for small local models (nemotron-3-nano) used in the greeter robot, along with TTS text normalization improvements and better conversation summary handling.

Overview

[Provide a brief overview of the changes in this pull request.]
(If applicable, linked issue: [ ])

Type of change

• Bug fix
• [v] New feature
• Documentation improvement
• Bounty issue submission

Changes

Simplified LLM stack:

• src/llm/plugins/qwen_llm_simplified.py — LLM plugin that builds Actions directly, bypassing convert_function_calls_to_actions to preserve field names for single-field interfaces. Includes text fallback for when the model returns plain text instead of tool calls.
• src/actions/greeting_conversation_simplified/interface.py — Single-field interface (response: str) with a short docstring optimized for small LLMs.
• src/actions/greeting_conversation_simplified/connector/greeting_conversation_kokoro_simplified.py — Self-contained connector that hardcodes conversation state values and applies TTS normalization.

TTS text normalization (src/providers/tts_text_utils.py):

• Added address abbreviation expansion (St→Street, Ave→Avenue, Blvd→Boulevard, etc.)
• Added directional abbreviation expansion (N/S/E/W → North/South/East/West)
• Added time reformatting ("11:00" → "11", "3:30" → "3 30")
• Added non-ASCII character stripping to prevent TTS issues with non-English text

Improved history summarization handling:

• Added summary detection filters in qwen_llm_simplified.py to prevent the model from speaking conversation summaries back to users.

Fuser fix:

• Included filters for low confidence knowledge base retrievals
• Fixed question_prompt undefined variable error when AVAILABLE ACTIONS section is empty
• Added logic to skip LAWS and AVAILABLE ACTIONS sections when their content is empty

[codecov]

Codecov Report

❌ Patch coverage is 51.20773% with 101 lines in your changes missing coverage. Please review.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/llm/plugins/qwen_llm_simplified.py	21.42%	88 Missing ⚠️
src/providers/tts_text_utils.py	0.00%	11 Missing ⚠️
src/providers/llm_history_manager_simplified.py	96.96%	2 Missing ⚠️

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