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A negative w (uniform or projective) turns mapped triangles inside out though the 3x3 block does not mirror; the flip and the normal sign now follow the 4x4 determinant, falling back to the 3x3 block when the last row is zero. The tree walk read each structure's globals schema with its own full allowance, then again for the globals. It now reads it once, charged to the walk, and continues from there for the globals. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01SqmHYx8FiWM5PcsoiErgp9