This event is designed to provide clarity (when signing) about the agreement being created. It is NOT published to a relay - instead, it is saved in an encrypted zip.
```json
{
"kind": 1603,
"content": "You are signing an Agreement Template for the following npubs:\n- npub1\n- npub2\n\nEnsure this event is sourced from a trusted SIGit instance.",
"created_at": 1716564780,
"id": "...",
"sig": "...",
"pubkey": "pubkey of CREATOR",
"tags":[
["signers","npub1d0csynr..","npub1nqulz.."],
["viewers","npub1viewer1"], // optional tag, only if there are viewers
["files","hash1:name1.csv","hash2:name2.pdf"], // extension determines the file type. Order determines index.
["meta","hash1"] // the hash of the meta.json file
