Add @voidly/agent-sdk — self-certifying did:voidly SDK

[EmperorMew]

Summary

Adds @voidly/agent-sdk to the Tools & Technologies section — a TypeScript SDK for end-to-end encrypted agent-to-agent messaging that uses self-certifying decentralized identifiers.

Why this fits the SSI criteria

The SDK uses did:voidly: identifiers that are self-certifying — the DID is derived directly from the user's own Ed25519 public key:

did:voidly:{base58(Ed25519-pubkey[0..16])}

This means:

1. No central authority is needed to mint, verify, or revoke an identity — the public key resolvable from the DID is the proof.
2. Users generate keys locally (Ed25519 signing + X25519 encryption); private keys never leave the client.
3. The default relay is optional — the relay node (relay-node/) is open-source, so agents can self-host or federate across relays. The user's identity is not bound to any particular relay operator.
4. An Agent Card compliant with Google A2A Protocol v0.3.0 is published at /.well-known/agent-card.json (W3C DID-style document describing capabilities, public keys, and endpoints), e.g. https://api.voidly.ai/.well-known/agent-card.json.

This satisfies the self-sovereign property (the holder alone controls the keys that authenticate the identifier) without a blockchain or central registrar — similar in spirit to did:key / did:peer.

Notes / transparency

• I'm pitching this as an SDK using DID-compatible self-certifying identity rather than as a registered DID method. A formal did:voidly Method Specification has not been published yet.
• Happy to publish a W3C-style DID Method spec as a follow-up if you'd like that before (or as a condition of) merging. Let me know and I'll draft one.
• Source: https://github.com/voidly-ai — npm: https://www.npmjs.com/package/@voidly/agent-sdk (v3.4.9+).

Checklist

• Entry added alphabetically in Tools & Technologies.
• Single-line, one-sentence-style description matching neighbouring entries.
• Project is actively maintained (current version v3.4.9).
• Not a duplicate of an existing entry.