Initial TrueGrowth source import

openspec/changes/refactor-workflow-shell/proposal.md

@@ -0,0 +1,21 @@
+# Change: refactor workflow shell
+
+## Why
+
+Video analyzer, MV creator, and music analyzer duplicate the same workflow container concerns: step navigation, history/starred state, record loading, and completed task synchronization. This makes small fixes expensive and increases the chance of lifecycle leaks or divergent behavior.
+
+## What Changes
+
+- Add shared internal workflow shell primitives for step bars, record state, and task synchronization
+- Migrate the three workflow containers to those shared primitives without changing user-facing behavior
+- Preserve existing storage keys, record schemas, task metadata, provider routing, media handling, and service worker behavior
+- Add focused unit tests for the shared primitives and container-critical edge cases
+
+## Impact
+
+- Affected specs: `workflow-shell`
+- Affected code:
+  - `packages/drawnix/src/components/shared/workflow/`
+  - `packages/drawnix/src/components/video-analyzer/`
+  - `packages/drawnix/src/components/mv-creator/`
+  - `packages/drawnix/src/components/music-analyzer/`