Wrapper tool hardening and cleanup

MUSIC_REFACTOR_CONTRACT.md

@@ -1,5 +1,24 @@
 Refactor the music generation / editing / credits pipeline so it exists entirely inside the shared toolkit and is no longer hardcoded or repository-specific.
 
+## Status Snapshot
+
+Current state as of 2026-05-13:
+
+- This refactor is largely implemented.
+- Music logic now lives under `internal/music/` with toolkit-owned CLI entry
+  points and shared use from `build-haks`.
+- Dataset-based config is supported and documented; the toolkit exposes
+  `music list-datasets|scan|build|credits|validate|manifest|normalize`.
+- Incremental credits artifact handling and compact/verbose log presentation are
+  present in the current implementation.
+
+Remaining work:
+
+- finish retiring old `music.prefixes`-only assumptions in docs/tests after all
+  consumer configs are fully dataset-native
+- continue separating any remaining music-specific presentation rules from
+  broader `build-haks` output policy as the build graph evolves
+
 Goal: Turn the current Shadows Over Westgate-specific music pipeline into a reusable, repository-agnostic toolkit subsystem that can operate across multiple projects and datasets with configuration-driven behavior.
 
 # Requirements