RFC: Multi-agent Merkle DAG integrity stitching and remote tile sync protocol (gx-sync)

[mahirhir]

Summary

To support multi-agent parallel execution, CI receipt verification, and cloud-to-local integrity sync, we propose adding a distributed sync and integrity stitching layer (gx-sync):

1. Multi-Agent Merkle DAG Stitching: Allow receipts to reference parent digests (parent_receipt_digests), ordering concurrent tool executions deterministically.
2. Remote Merkle Tile Sync Protocol: RFC 9162 tile-based range sync over HTTP / Git / S3 for lightweight offline-verifiable audit logs.
3. Cryptographic Self-Verifying Auto-Update: Background TUF/Minisign signature verification for in-place binary upgrades.

The full specification currently lives in an internal design document (2026-08-27) that has not been published in this repository yet, so the pointer that used to sit here was useless to anyone reading this — it will land under docs/ before implementation starts. Feedback and contributions are welcome.

[mahirhir]

Status as of 2026-09-01: design only. There is no gx-sync crate in the tree and parent_receipt_digests is not implemented anywhere yet. I also edited the issue body: it referenced the spec by a local filesystem path, which was useless to anyone reading this — the spec will be published under docs/ before implementation starts.