A kanban worker that exhausted its retries purely on a provider rate
limit / quota wall (e.g. opencode-go's 5-hour window) exited with code 1.
The dispatcher counted that as a crash, and with DEFAULT_FAILURE_LIMIT=2
two quota-wall hits permanently blocked the card. Fanning out many
workers against one shared quota made this routine.
Now a rate-limited worker exits with EX_TEMPFAIL (75); the dispatcher
classifies that as a 'rate_limited' exit, releases the task back to
'ready' WITHOUT incrementing consecutive_failures (the breaker can't trip
on a transient throttle), and the respawn guard defers the next attempt
on a cooldown (default 5min, HERMES_KANBAN_RATE_LIMIT_COOLDOWN_SECONDS)
until the quota window clears. Genuine crashes still count and trip the
breaker as before. The 120s Retry-After cap is unchanged — no worker
parks for hours holding a slot.
- conversation_loop.py: surface failure_reason in the exhaustion return
- cli.py: kanban worker picks exit 75 on rate_limit/billing failure
- kanban_db.py: rate_limited exit kind, no-count requeue, cooldown guard
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