Update prompt templates and regex pattern to use tagged placeholders for better clarity

src/gaia_solving_agent/agent.py

@@ -77,7 +77,7 @@ class GaiaWorkflow(Workflow):
     async def parse_answer(self, ev: AnswerEvent) -> StopEvent:
         llm = get_llm()
         prompt_template = RichPromptTemplate(FORMAT_ANSWER)
-        pattern = r"Question :\s*(.*)[\n$]"
+        pattern = r"<Question> :\s*(.*)[\n$]"
         search = re.search(pattern, ev.plan)
         question = search.group(1) if search else ""
         result = llm.complete(prompt_template.format(question=question))

src/gaia_solving_agent/prompts.py

@@ -25,11 +25,11 @@ User query: "{{ user_request }}"
 
 Respond with exactly:
 '''
-1. Question : xxxxxxx
-2. Known facts:
+1. <Question> : xxxxxxx
+2. <Known facts>:
 - xxxxxxx
 - xxxxxxx
-3. Sub-tasks:
+3. <Sub-tasks>:
 {% if additional_file_extension|length -%}
 - There is an additional file to analyse. It's file extension is {{ additional_file_extension }}. You must analyse it to find out
 {%- endif %}