Conflicts with the generation-aware references (#1143): stream lengths are
kept by full reference, with whether resolving them read unsaved edits; a
repaired slot counts as an edit read like any other.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SqmHYx8FiWM5PcsoiErgp9