remove boiler plate prompt

cht/agent/openai_connection.py

@@ -31,10 +31,6 @@ from cht.agent.base import (
 
 log = logging.getLogger(__name__)
 
-SYSTEM_PROMPT = """You are an assistant integrated into CHT, a screen recording and analysis tool.
-You help the user understand what happened during their recording session.
-Be concise and specific. Focus on what's visible in the provided frames."""
-
 _PROVIDER_CONFIGS = {
     "groq": (
         "https://api.groq.com/openai/v1",
@@ -76,7 +72,7 @@ def _frame_to_base64(path) -> str | None:
 
 def _messages_to_openai(messages: list[Message]) -> list[dict]:
     """Convert structured messages to OpenAI chat format."""
-    result = [{"role": "system", "content": SYSTEM_PROMPT}]
+    result: list[dict] = []
 
     for msg in messages:
         if isinstance(msg, UserMessage):