Defense: DESIGN.md Roadmap states B1 core death has no fallback and sync-lag rollback lands in B2. This narrows spec/core.md to the first Basement slice, moves fallback sync and migration to a deferred B2 spec, and codifies repository hygiene so agents use worktrees, commit coherent work, and track only constitutionally justified files.
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Co-Authored-By: Letta Code noreply@letta.com