Update spaces-agents.md to match prod agents.md output

[mishig25]

Keeping the agents.md snippet up to date with prod.

---

Note

Low Risk
Documentation-only change to spaces-agents.md; no runtime or API behavior changes in this PR.

Overview
Updates docs/hub/spaces-agents.md so the documented agents.md response and examples match production: /gradio_api/call/v2/{endpoint} with named parameters (replacing the legacy call/{endpoint} + {"data": [...]} shape), plus the file-upload line and auth text that includes the tokens settings URL.

Adds a File inputs section (upload via /gradio_api/upload, then FileData in the v2 call) and refreshes the intro, sample snippet, auth curl, and the numbered agent workflow to include upload and v2.

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[gary149]

is this feature documented @mishig25 ? I dont remebmer

I'd rather document this first (the fact that it exists and that you dont think to think to use a space you like with your agents) and then write about the details.

[mishig25]

It is literally this page I'm updating, no ?

https://huggingface.co/docs/hub/spaces-agents

[gary149]

ok