Clicking "DeepSeek web UI..." opened two tabs: the web tab asked for, and a
shell tab running the server next to it. The shell was deliberate - the server
lived in an ordinary session so it was visible, scrollable, killable and died
with its tab, and nothing new had to supervise a long-lived HTTP server. That
reasoning was sound and the result was still wrong in use: opening a dashboard
should open one tab, and after the first launch the terminal is pure noise.
The server moves to a background child process owned by a new
`src/deepseek-web-server.ts`, behind `POST /api/deepseek/web`. What the session
gave away for free is now explicit, which is most of the module:
- Exactly one server. A second click reuses the running one instead of racing
it for a port; the session flow could not do this at all, because two clicks
were simply two sessions.
- Restarted when the requested authority changes. `--trusted-host` fences dsh's
own /api against the browser authority, and a Codeman reachable at both
loopback and a tailnet name has two. Reusing a server fenced for the other
origin renders a page whose every call 403s, which reads as a broken
dashboard rather than a misconfigured one, so a mismatch restarts instead.
- Killed on shutdown. The child is detached so its whole plugin tree can be
signalled at once, which also means it would outlive Codeman and hold its
port against the next start - the exact EADDRINUSE this feature already got
wrong once.
- Boot output captured and returned. With no shell tab there is nowhere else
for a stack trace to land, so a failed spawn reports its own tail.
The endpoint is fenced at the same bar as the profile installer and for the
same reason: booting a dsh profile executes the plugin code in it, so this is a
privileged action even though it reads as "open a page". `authority` comes from
the client (`location.host`) because only the browser knows which origin is in
play, and it is regex-confined at the schema boundary - defence in depth behind
the argv-array spawn, admitting host:port in the shapes a browser authority can
take and nothing readable as a second argument.
`GET /api/deepseek/web-port` is gone; port selection moved into the supervisor,
which is the thing that knows whether a server is already running. The two
client-side probe helpers went with it, since the server now owns the wait.
Verified over the tailnet authority end to end: no session is created (session
count unchanged, one tab), the server runs on 3081 beside the user's own dsh
web on 3080, status reports the tailnet authority, and the proxied dashboard
renders with zero 4xx. Full gate green (6148 passed, +6).
Codeman maintainer
c30dfaf0e7