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feat: the worker-lanes card — see each lane, change its slots (4294)
Milestone 422 step 4. Rule 27: no UI, no ship. This is where the previous
three steps become usable.

REACHABLE AT: Settings -> Activity -> Worker lanes, directly under the
"Queues + workers" pane. Written from opening the view, not from memory of
having built it — lesson #4282, and #3463 is the same trap landing inside
milestone 365, where the System page shipped with no navigation to it.

Under that pane deliberately, not in the System tab. System answers "is
everything running", where every control would be about something broken.
This is about something working that should work harder, and it belongs
beside the backlog it reacts to: you watch a queue grow and give that lane
another slot without leaving the pane.

Per lane: queues, pending, busy, a stepper, an enable switch.

- PENDING is depth + reserved, not LLEN. Celery prefetches, so LLEN alone
  reads 0 while a worker holds tasks in memory — the number that would make
  someone think a buried lane was idle.
- NOT ANSWERING, never "stopped". present=false means nothing replied; saying
  stopped would send the operator looking for a crash that has not happened.
- THE CEILING IS ON SCREEN, with "(memory)" on the ML lane. It is the one
  number here the operator cannot change, so it has to justify itself; a
  greyed stepper with no explanation reads as a bug.
- `busy` is per lane, so adjusting one does not freeze the others.

TWO OUTCOMES THAT MUST NOT COLLAPSE INTO ONE MESSAGE. A stored-but-unpushed
change (applied:false — the lane is restarting) is information: the value is
saved and the reconcile will carry it, so the card says so and invites
waiting. A refused value (400) is an error and shows the endpoint's own
sentence. Collapsing them would make one of the two invite the wrong action.

A BUG CAUGHT BEFORE COMMIT: the card read `e.detail?.detail`, but ApiError
puts the parsed body on `.body` and `.message` on the short `error` key. It
would have shown the operator the bare word "refused" with no reason — the
exact failure that line exists to prevent. The test would not have caught it
either: `rejects.toThrow()` passes whether the sentence is reachable or not.
It now asserts `err.body.detail` specifically.

Also: queueOptions in SystemActivityTab was a fourth hand-kept copy of the
queue list and had drifted — `maintenance_long` was missing, so activity on
that lane could not be filtered for at all despite four task routes pointing
there. Added, and DELIBERATELY left as a written-out list rather than derived
like the other three were: this filters task_run HISTORY, so a derived list
would hide the filter for any queue that has rows but no longer has a lane —
precisely when someone is looking — and would be empty whenever the endpoint
is down.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LVjrnpQjRgHdvq95rASoiR
2026-09-22 08:23:14 -04:00
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