ut3_orthogonalization

Orthogonalization for uniform supercores – SVD-based so the masks stay a deterministic prefix.

Supercore-level sweeps, their core-level mirrors, and ut3_orthogonality_residual. Why SVD rather than QR is load-bearing: docs/contributor/uniform_svd_prefix_orthogonalization.md.

Functions

ut3_orthogonality_residual(data, side)	Uniform analog of t3_orthogonality_residual(): non-enforcing check of left/right-orthogonal
down_orthogonalize_tucker_supercores(tucker_supercore, ...)	Bare batched Tucker SVD on supercores (assumes masked input): rows orthonormal over the mode
ut3_down_orthogonalize_tucker_cores(data)	Orthogonalize the Tucker cores (rows orthonormal over the mode index), pushing the remainder up
up_orthogonalize_tt_supercores(tucker_supercore, ...)	Bare batched TT-up SVD on supercores (assumes masked input): the TT mode index becomes orthonormal
ut3_up_orthogonalize_tt_cores(data)	Up-orthogonalize the TT cores (mode index orthonormal over the bonds), pushing the remainder down
ut3_left_orthogonalize_tt_cores(data)	Left-orthogonalize the TT cores (shared polymorphic sweep). Bond ranks: L->R recurrence.
ut3_right_orthogonalize_tt_cores(data)	Right-orthogonalize the TT cores (shared polymorphic sweep). Bond ranks: R->L recurrence.