Docs: protocol v2 (hub-protocol.md §6), README, deployment.md (Upgrading to 2.0), plan marked done, CHANGELOG 2.0.0; versions 2.0.0. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Docs: protocol v2 (hub-protocol.md §6), README, deployment.md (Upgrading to 2.0), plan marked done, CHANGELOG 2.0.0; versions 2.0.0. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>