Broaden F6 beyond workspace files: own diffable predicate (file:/untitled:)
decoupled from F2 isTracked; baseline → global storage keyed by URI hash;
untitled buffers in-memory. Adds §11 amendment + updates §1.7/§6.3/§6.5/§6.7/
INV-19 and the change log. Built in session 0019.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Ben Stull