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lockstep_binds_every_session_not_the_asker — moving a shared value for the client that asked is a desync with a polite name. Proven by improvise-kvyt: a view switch moved only the addressing session's mirror while every client's grid is built from workbook.active_view(). an_invariant_is_made_unrepresentable_not_validated — records why the PR agent declined Copilot's request to validate parallel-slice lengths on five gp-tree functions, and what the real remedy is. Same reasoning as improvise-n3wt, which removed exactly that asserted form in the same PR. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01EoW5BB87ZZdm96SvBTWawH