Two #31-tick findings that would strand an unattended run. The qwen
worker hit its weekly 429 mid-tick; the obvious fallback
deepseek/deepseek-v4-pro is wrong because the deepseek provider has no
models (only catalog overrides) and fails silently — the model lives on
the go gateway as go/deepseek-v4-pro, with go/glm-5.3-flash the next
rung. And the async subagent runner has died without persisting a
session, so legs launch in the foreground and a dead worker is recovered
by completing, never re-implementing.
Closes#243
logan