feat: plan composition phases and persist named arrangement markers

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Johannes Findeisen 2026-11-06 00:29:48 +01:00
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# Arrangement and composition workflows
All mutations run on the control thread through the existing stop, history and
prepared-plan workflow. No new dependencies are required.
## Phase 58 — Persistent Arrangement Markers
Edit/Markers/Set at cursor adds or renames a marker; Remove at cursor removes the exact tick key. Markers draw names and vertical guides in the arrangement and survive project save/load and undo. Up to 128 markers are supported. Names may overlap visually when markers are close; markers do not change playback by themselves.