feat: Core Data Models & Persistence

Merged feature data-models via SDLC orchestration.

.sdlc/state.yaml

@@ -10,8 +10,8 @@ active_work:
           branch: feature/task-management-ui
           phase: ready
 blocked: []
-last_updated: 2026-02-09T21:09:47.934788688Z
+last_updated: 2026-02-09T21:06:02.870386469Z
-last_action: TRANSITION
+last_action: CREATE_BRANCH
 last_actor: cli
 history:
     - timestamp: 2026-02-09T21:04:37.081727351Z
@@ -64,73 +64,8 @@ history:
       feature: data-models
       actor: cli
       result: success
-    - timestamp: 2026-02-09T21:06:07.216216684Z
+    - timestamp: 2026-02-09T21:06:02.870385016Z
-      action: TRANSITION
+      action: CREATE_BRANCH
-      feature: data-models
-      actor: cli
-      result: success
-    - timestamp: 2026-02-09T21:06:22.774510416Z
-      action: APPROVE_ARTIFACT
-      feature: task-management-ui
-      actor: user
-      result: success
-    - timestamp: 2026-02-09T21:07:57.095111184Z
-      action: TRANSITION
-      feature: data-models
-      actor: cli
-      result: success
-    - timestamp: 2026-02-09T21:08:01.198129105Z
-      action: APPROVE_ARTIFACT
-      feature: task-management-ui
-      actor: user
-      result: success
-    - timestamp: 2026-02-09T21:08:17.18356799Z
-      action: PASS_ARTIFACT
-      feature: data-models
-      actor: user
-      result: success
-    - timestamp: 2026-02-09T21:08:26.218194073Z
-      action: APPROVE_ARTIFACT
-      feature: task-management-ui
-      actor: user
-      result: success
-    - timestamp: 2026-02-09T21:08:32.202898391Z
-      action: TRANSITION
-      feature: data-models
-      actor: cli
-      result: success
-    - timestamp: 2026-02-09T21:08:36.936042472Z
-      action: TRANSITION
-      feature: task-management-ui
-      actor: cli
-      result: success
-    - timestamp: 2026-02-09T21:08:57.362781538Z
-      action: TRANSITION
-      feature: task-management-ui
-      actor: cli
-      result: success
-    - timestamp: 2026-02-09T21:09:08.212435162Z
-      action: PASS_ARTIFACT
-      feature: data-models
-      actor: user
-      result: success
-    - timestamp: 2026-02-09T21:09:17.292754559Z
-      action: TRANSITION
-      feature: data-models
-      actor: cli
-      result: success
-    - timestamp: 2026-02-09T21:09:37.382126788Z
-      action: PASS_ARTIFACT
-      feature: data-models
-      actor: user
-      result: success
-    - timestamp: 2026-02-09T21:09:42.201428414Z
-      action: TRANSITION
-      feature: data-models
-      actor: cli
-      result: success
-    - timestamp: 2026-02-09T21:09:47.934785853Z
-      action: TRANSITION
       feature: data-models
       actor: cli
       result: success