Proof - Collaborative Markdown Editor Proof is a collaborative document editor for humans and agents. It supports two modes: 1. Web API - Create and edit shared documents via HTTP (no install needed) 2. Local Bridge - Drive the macOS Proof app via localhost:9847 Identity and Attribution Every write to a Proof doc must be attributed. Two fields carry the agent's identity: - Machine ID ( on every op, header): — stable, lowercase-hyphenated, machine-parseable. Appears in marks, events, and the API response. - Display name ( on ): — human-readable, shown in Proof's presence chips and comment-auth…