Two bugs fixed:
1. agent-runner error path race condition: when agent process exited
with error, the promise resolved immediately without waiting for
outputChain, allowing a late wrappedOnOutput to re-persist a stale
session ID after clearSession had already run.
2. follow-up turn state not resetting: when a follow-up IPC message
joined an active run, turn-level flags (finalOutputSentToUser,
sawNonProgressOutput) from the first turn prevented the last
progress from being promoted to a final message.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
