Plain-language 'related prior work' instead of 'prior art'; replace the
dev-shaped 'meaningful landing (a merge, a shipped feature, a finished plan)'
with concrete neutral triggers — log on task completion and when a problem is
found, so direction pivots are captured, not just successes. Keeps the static
mandate domain-neutral (pre-empts B9 drift in plan 812).
Refs task 809 / plan 812 item A1.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>