feat(tui): add real-time streaming LLM output with full content display

- Convert LiteLLM requests to streaming mode with stream_request()
- Add streaming parser to handle live LLM output segments
- Update TUI for real-time streaming content rendering
- Add tracer methods for streaming content tracking
- Clean function tags from streamed content to prevent display
- Remove all truncation from tool renderers for full content visibility

strix/interface/tool_components/agent_message_renderer.py

@@ -181,4 +181,10 @@ class AgentMessageRenderer(BaseToolRenderer):
         if not content:
             return Text()
 
-        return _apply_markdown_styles(content)
+        from strix.llm.utils import clean_content
+
+        cleaned = clean_content(content)
+        if not cleaned:
+            return Text()
+
+        return _apply_markdown_styles(cleaned)