`server_error` and `timeout` join the transient-provider set that makes a Kanban
worker exit 75 (EX_TEMPFAIL). A provider outage or a hung connection says
nothing about the task, so the dispatcher requeues without a failure tick
rather than counting toward the circuit breaker (#91206 proposed the same set).
The non-quiet one-shot path exited 0 unless a Kanban worker was running, so
scripts could not tell a failed `hermes chat -q` from a good one and an
incomplete turn (partial, iteration budget) still read as success (#111770).
Both one-shot paths now share one contract: 0 completed, 1 failed / partial /
incomplete / never ran, 130 interrupted. The Kanban EX_TEMPFAIL sentinel also
fires for `upstream_rate_limit` (aggregator's upstream 429) and `overloaded`
(503/529): neither says anything about the task, so the dispatcher should
requeue without a failure tick rather than count it toward the breaker.
The Kanban dispatcher spawns workers as `hermes ... chat -q <prompt>`
(`kanban_db.py::_default_spawn`). That path ran the turn and fell through
to an implicit 0 whatever happened — success, failure, or a provider
quota wall.
`detect_crashed_workers` reads rc=0 with the task still `running` as a
protocol violation, and protocol violations trip the breaker at
`failure_limit=1`, so a single HTTP 429 blocked the card permanently and
every card queued behind it stayed in `todo` forever waiting on a parent
that could never reach `done`.
`KANBAN_RATE_LIMIT_EXIT_CODE` (EX_TEMPFAIL) exists precisely to prevent
this: `_classify_worker_exit` maps it to a `rate_limited` kind and the
task is released back to `ready` without counting a failure. The consumer
end was complete and tested. The producer end was wired into the `-Q`
path only — the one the dispatcher does not use.
This extracts that mapping into `_single_query_exit_code()` and applies it
on both one-shot paths. `chat()` returns the rendered response string, so
the non-quiet path could not see the outcome; `_chat_settle_turn` now
records the raw turn result for it to read.
Scope is deliberately narrow. The non-quiet path only exits non-zero when
`HERMES_KANBAN_TASK` is set, so interactive runs and ordinary `hermes chat
-q` invocations still exit 0 exactly as before. For a dispatcher-spawned
worker the full contract now applies: 0 on success, 1 on failure, and the
sentinel on a rate-limit/billing wall.
Tests cover the path that was missed rather than the one that already
worked: 16 of the 17 new assertions fail on the parent commit, and the
key regression fails as `assert None == 75` — the exact rc=0 fall-through
— rather than on a missing symbol. The seventeenth asserts that a human's
one-shot run keeps exiting 0, and passes both before and after.
teknium1