docs(newos4): clear the help.html command backlog, and make it detectable

help.html had not been touched since 2026-08-02. Auditing the page against the
code found 74 commands the runtime registers but the docs never mentioned, and
4 rows documenting commands that no longer exist.

Documented (by section): terminal 11 (dashboard --watch/--stop, usage, ps, top,
df, free, history, run, sysmsg, view_module), a2a 6, AI 14 (webxai/webx/wx,
context*/smart-ask, commit-*, ai-model/ai-ignore), vaultmind 4, debug 2, filesystem 2,
sessions 1, memory-graph 3, modules 4, neural-vfs 1, agents 3, web 1, voice 3,
config 3, extras 8 (kanban, three, course, gzip, wget, gui-*), vault 2 (encrypt/decrypt),
skills 5, webdav 1, plus an alias row for h/s/ll.

Removed ghost rows: commands, check, sandbox-kill, webdav-explorer -- none are
registered anywhere in modules/; the sandbox prose no longer promises sandbox-kill.

New check: scripts/newos4-maintain.py check_help_coverage() derives the command
list from terminal.js (_baseWhitelist, internals, cmd === dispatch) plus every
commands['...'] registration in modules/ and compares it with help.html, so the
next gap shows up in the daily maintenance run instead of rotting for 11 weeks.

Verified: html.parser 0 errors (before the fix my own insertion broke the page --
a signature containing <script> opened a script element), 355/355 commands
documented, maintenance OK, 449 command rows in the DOM, 360/390 px 4/4 OK,
perms fixed (atlas.json, course.js were 664).

0 files changed, 0 insertions, 0 deletions