Adds a "History…" context-menu item on markdown files in a history:true
subtree (server mode only — the audit is server-stamped). It opens a modal
that lists every saved version newest-first (timestamp + author + size,
current flagged), lets you View any version, Diff any two, and Restore one
(a forward PUT — non-destructive).
- shared/diff.js: dependency-free line/word LCS diff (window.zddc.diff),
prefix/suffix trimming + a cell cap so large files don't stall the UI.
- browse/js/history.js: the modal (list / view / diff / restore), talking to
GET <url>?history=1 and ?history=<sha>.
- loader.js carries the per-file history flag; events.js adds the menu item.
- Wired diff.js + history.js + history.css into browse/build.sh; diff.js into
the zddc-test.html shim. tests/diff.spec.js covers the diff algorithm.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
