add agent history

[ArnavAgrawal03]

No description provided.

[jazzberry-ai]

Bug Report

Name	Severity	Example test case	Description
System Prompt Inconsistency	High	1. Set agent system prompt. 2. Send query. 3. Send follow-up query. 4. Observe system prompt is missing in follow-up.	The system prompt is not consistently applied before the conversation history in each request, causing the agent to lose context and potentially deviate from its intended behavior.
Incomplete History	Critical	1. Send initial query. 2. Send follow-up query asking about the previous query. 3. Observe agent fails to recall previous query.	The conversation_history[:-1] slice in core/agent.py excludes the last message (current user query), causing the agent to lose context and unable to recall the history of the chat.

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