[nmrtist]

Summary

Assign 3D NMR peaks to protein residues and atoms, and keep those assignments when the project is reopened.

• Import multi-chain FASTA, bind spectra to a molecule, and use the Protein assignments panel to edit candidates and locate peaks from residues across spectra.
• Save partial and alternative assignments, validate atoms against peptide position and axis nucleus, and distinguish an unresolved member from a shared resonance in atom groups. Confirmation is explicit.
• Keep assignments tied to stable peak IDs through slicing, phase changes, and undo/redo. Share editing and paginated inspection across the desktop, CLI, and MCP, with JSON export for observations and provenance.

Validation

• cargo pr-check — passed. Regression tests cover project and recovery round trips, peak identity across undo branches, atom group semantics, and CLI/MCP editing and export.
• Desktop widget tests — passed. They cover candidate editing, scrolling to Save in the task card, cross-spectrum navigation, and confirming a clear against the original spectrum.
• npm run build in docs/ — passed.

UI display logic

• New or changed actions go through the command catalog (CommandId + describe) and are searchable in the command palette.
• Hiding happens only at Ribbon-group level (dataset kind or width budget); transient states disable with a disabled_reason that says how to unblock.
• No layout changes from background events; panels are never auto-closed.
• New panels or empty regions show an empty state with a next step.
• Docs updated in docs/ (English and zh-CN) for user-visible behavior.