AJ14314/Deep_Research_Enhanced

fix: remove LLM from email, direct md->html, catch all SendGrid errors

fix: robust JSON parsing in email_agent

fix: robust JSON parsing - strip markdown fences, clean fallback

fix: remove json_object mode (Groq incompatible), graceful SENDGRID missing

fix: remove openai-agents (mcp conflict), rewrite with openai SDK + Tavily

updated code

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