Add GitAgent Protocol support (agent.yaml + SOUL.md)

[computer-agent]

Hi Matt! 👋 This PR adds GitAgent Protocol (GAP) support to TakedownGPT — a small, open standard for portable AI agents (https://gitagent.sh).

What this adds (nothing else changes):

• agent.yaml — a standard manifest capturing TakedownGPT's name, version, model preferences (openai:gpt-4o / gpt-3.5-turbo), its three skills (WHOIS/RDAP lookup, web search, email drafting), and compliance info (human_in_the_loop: destructive — the agent drafts, the human sends)
• SOUL.md — TakedownGPT's persona and instructions in the standard format, distilled faithfully from the README and app.py

With these two files, TakedownGPT can be listed in the Open GAP registry and run on any GAP-compatible runtime. Neither file touches your existing code — they're purely additive metadata.

Totally optional to accept — feel free to tweak the wording in SOUL.md or adjust model preferences in agent.yaml. Happy to revise anything that doesn't feel right. Thanks for building TakedownGPT in the open! 🙌

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⭐ If GAP looks like a useful standard, the project lives at https://github.com/open-gitagent/opengap — a star helps more maintainers discover it.

[mrwadams]

Thanks for the contribution and for the interest in TakedownGPT! 🙏

I've decided not to adopt the GitAgent Protocol here — TakedownGPT is a Streamlit app rather than a portable agent runtime, so the agent.yaml / SOUL.md manifest isn't a natural fit for how this project is built and run. Closing for now, but I appreciate you taking the time to put it together.