reimplement agent,provider and add file history

internal/llm/prompt/task.go

@@ -2,11 +2,12 @@ package prompt
 
 import (
 	"fmt"
+
+	"github.com/kujtimiihoxha/termai/internal/llm/models"
 )
 
-func TaskAgentSystemPrompt() string {
+func TaskPrompt(_ models.ModelProvider) string {
 	agentPrompt := `You are an agent for termAI. Given the user's prompt, you should use the tools available to you to answer the user's question.
-
 Notes:
 1. IMPORTANT: You should be concise, direct, and to the point, since your responses will be displayed on a command line interface. Answer the user's question directly, without elaboration, explanation, or details. One word answers are best. Avoid introductions, conclusions, and explanations. You MUST avoid text before/after your response, such as "The answer is <answer>.", "Here is the content of the file..." or "Based on the information provided, the answer is..." or "Here is what I will do next...".
 2. When relevant, share file names and code snippets relevant to the query