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: 2026-02-11T01:07:08.914261508Z
+last_updated: 2026-02-11T01:03:20.536148072Z
-last_action: TRANSITION
+last_action: CREATE_BRANCH
 last_actor: cli
 history:
     - timestamp: 2026-02-11T01:01:34.898710806Z
@@ -64,73 +64,8 @@ history:
       feature: data-models
       actor: cli
       result: success
-    - timestamp: 2026-02-11T01:03:30.454035392Z
+    - timestamp: 2026-02-11T01:03:20.536145697Z
-      action: TRANSITION
+      action: CREATE_BRANCH
-      feature: data-models
-      actor: cli
-      result: success
-    - timestamp: 2026-02-11T01:03:39.883522826Z
-      action: APPROVE_ARTIFACT
-      feature: task-management-ui
-      actor: user
-      result: success
-    - timestamp: 2026-02-11T01:05:29.847017938Z
-      action: TRANSITION
-      feature: data-models
-      actor: cli
-      result: success
-    - timestamp: 2026-02-11T01:05:33.827896373Z
-      action: APPROVE_ARTIFACT
-      feature: task-management-ui
-      actor: user
-      result: success
-    - timestamp: 2026-02-11T01:05:49.529454093Z
-      action: PASS_ARTIFACT
-      feature: data-models
-      actor: user
-      result: success
-    - timestamp: 2026-02-11T01:05:58.955336964Z
-      action: APPROVE_ARTIFACT
-      feature: task-management-ui
-      actor: user
-      result: success
-    - timestamp: 2026-02-11T01:06:04.894750424Z
-      action: TRANSITION
-      feature: data-models
-      actor: cli
-      result: success
-    - timestamp: 2026-02-11T01:06:09.715870654Z
-      action: TRANSITION
-      feature: task-management-ui
-      actor: cli
-      result: success
-    - timestamp: 2026-02-11T01:06:29.028487145Z
-      action: TRANSITION
-      feature: task-management-ui
-      actor: cli
-      result: success
-    - timestamp: 2026-02-11T01:06:40.406576812Z
-      action: PASS_ARTIFACT
-      feature: data-models
-      actor: user
-      result: success
-    - timestamp: 2026-02-11T01:06:48.946187749Z
-      action: TRANSITION
-      feature: data-models
-      actor: cli
-      result: success
-    - timestamp: 2026-02-11T01:06:59.900936191Z
-      action: PASS_ARTIFACT
-      feature: data-models
-      actor: user
-      result: success
-    - timestamp: 2026-02-11T01:07:03.77155492Z
-      action: TRANSITION
-      feature: data-models
-      actor: cli
-      result: success
-    - timestamp: 2026-02-11T01:07:08.914260496Z
-      action: TRANSITION
       feature: data-models
       actor: cli
       result: success