Files: WebDAV mount + on-demand HLS transcoding

NextCloud-class storage on your substrate — network-drive mount, adaptive video streaming, version history as a subtable, expiring guest-upload links.

Files gives every file a place in the graph. Mount it as a network drive over WebDAV on macOS/Windows/Linux; stream video as HLS with adaptive bitrate and no pre-render step; keep a full version history as a row subtable you can diff and restore. Public shares are password-protected, expiring, and auditable — every share is a row. Uploads can auto-link to a Customer, Project, or Invoice so AI can walk the graph in one query.