The plan embeds Task 12's module and tests verbatim, so it still carried the `_current_space` read and the derivation that put the third-angle cone's short side away from the circles. Both replaced with what shipped, so a re-run of the task cannot transcribe the defects back. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01FKFStjEFzpGyLq5bMpWxTd