style(examples): ruff format RAG_QA_chatbot scripts

[mmabrouk]

Symptom

Python format CI failed on #4791: ruff format --check wanted to reformat two files.

Fix

Ran ruff format on:

• examples/python/RAG_QA_chatbot/backend/agent_loop.py
• examples/python/RAG_QA_chatbot/ingest/fix_urls.py

Verification

ruff format --check on both: 2 files already formatted.

https://claude.ai/code/session_01DEZYALzKjh9ocjkscaBWRT

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