Review findings (Medium+Low): a signal already aborted before runEditTurn is
called could not be honored by agent.abort() (the SDK AbortController isn't
created until run()), so the turn ran to completion — now it throws before
run() (INV-47). And a throwing onProgress relay is swallowed so observability
can never fail the turn (INV-44). Strengthened the unit + E2E to prove both.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Ben Stull