Rebuilt the /startnet editor (Fable/Opus 4-stage build) into tabs:
- Settings: server IP (+ menu timeout/default when a choice construct exists) as form fields; apply rewrites only the targeted tokens.
- Boot Menu: add/remove/reorder image entries; regenerates only the menu echo/dispatch + action blocks, refuses reorders that would desync the enrollment %choice% router.
- Raw: full-text editor (still source of truth) with line-number gutter, batch syntax highlighting, a lint panel (unmatched goto/label, CRLF), and diff-vs-current.
- History: timestamped snapshots on every save, per-row diff + restore.
New wim.py helpers (framework-free): parse/apply_settings, parse/apply_boot_menu, lint_startnet, save/list/read_snapshot, unified_diff; BACKUPS_DIR=/var/lib/pxe-webapp/startnet-backups.
Fable review fixed a CRITICAL pre-existing bug: update_startnet's newline=CRLF write retranslated posted CRLF into \r\r\n, corrupting boot.wim on every raw save; now normalizes to LF first. Also fixed a false CRLF lint warning (verbatim read) and menu payload validation. All JS inline (no CDN).
cc391529bd