Prune completed action items 1-4 and 8 (scrap-from-threat, schematic
upgrade and ship level removal, balancing tool cleanup, unlock
prerequisites), renumber the remaining three, and update stale
cross-references: cite REQ-LOCK-PREREQ and unlock_requires, reflect
that REQ-THREAT-SCRAP is now the 1/scrap_per_threat constant, and
drop the obsolete level-up wording from the artifact rule.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01DyCu8vwChKMbLJQ3xosYEN