16f356a760
Resolve Phase 8 open question 0.3 — TrackDto gets a nested Release (ReleaseDto); flat release fields removed, all consumers updated as part of §8.0 (flat read-model rejected). Add §0.6 implementation sequencing: five mergeable waves with Waves 1+2 as a single deployment unit and Waves 3+4 parallelizable. Update PLAN.md §8.0 Shape to match.