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Claude 90c971539c refactor(cmd): introduce command algebra with Binding::Sequence and unified primitives

Add Binding::Sequence to keymap for composing commands, then use it
and parameterization to eliminate redundant command structs:

- Unify MoveSelection/JumpToEdge/ScrollRows/PageScroll into Move
- Merge ToggleGroupUnderCursor + ToggleColGroupUnderCursor → ToggleGroupAtCursor
- Merge CommitCellEdit + CommitAndAdvanceRight → CommitAndAdvance
- Merge CycleAxisForTile + SetAxisForTile → TileAxisOp
- Merge ViewBackCmd + ViewForwardCmd → ViewNavigate
- Delete SearchAppendChar/SearchPopChar (reuse AppendChar/PopChar with "search")
- Replace SaveAndQuit/OpenRecordRow with keymap sequences
- Extract commit_add_from_buffer helper for CommitCategoryAdd/CommitItemAdd
- Add algebraic law tests (idempotence, involution, associativity)

https://claude.ai/code/session_01Y9X6VKyZAW3xo1nfThDRYU

2026-04-11 00:06:48 -07:00