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Fix `Multiline` (`MultilineMPS`/`MultilineMPO`) correctness and API inconsistencies - #508

Merged

lkdvos merged 8 commits into

mainfrom

Oct 5, 2026

Merged

Fix `Multiline` (`MultilineMPS`/`MultilineMPO`) correctness and API inconsistencies#508
lkdvos merged 8 commits into
mainfrom
bd/multiline

Commits on Oct 2, 2026
- Treat `Multiline` as a sequence of lines
  
  lkdvos
  and
  claude
  committed
  0ab4e56
- Restrict `MultilineMPS`/`MultilineMPO` line types and allow finite lines
  
  lkdvos
  and
  claude
  committed
  294b566
- Add `dominant_eigenvalue` for boundary MPS fixed points
  
  lkdvos
  and
  claude
  committed
  5e1297a
- Custom `show` for `MultilineMPS` and `MultilineMPO`
  
  lkdvos
  and
  claude
  committed
  edba5ff
- Document multiline conventions and `dominant_eigenvalue`
  
  lkdvos
  and
  claude
  committed
  9587b88
- Make `Multiline` a plain vector of its lines
  
  lkdvos
  and
  claude
  committed
  3dc6521
- Address review comments on #508
  
  lkdvos
  and
  claude
  committed
  28f0b35
Commits on Oct 3, 2026
- export leading_eigenvalue
  lkdvos
  committed
  bd92d6f