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: 2026-02-10T16:53:07.40747065Z
+last_updated: 2026-02-10T16:50:37.115541262Z
-last_action: TRANSITION
+last_action: CREATE_BRANCH
 last_actor: cli
 history:
     - timestamp: 2026-02-10T16:49:07.055427357Z
@@ -64,73 +64,8 @@ history:
       feature: data-models
       actor: cli
       result: success
-    - timestamp: 2026-02-10T16:50:47.01280021Z
+    - timestamp: 2026-02-10T16:50:37.115530652Z
-      action: TRANSITION
+      action: CREATE_BRANCH
-      feature: data-models
-      actor: cli
-      result: success
-    - timestamp: 2026-02-10T16:50:56.623163065Z
-      action: APPROVE_ARTIFACT
-      feature: task-management-ui
-      actor: user
-      result: success
-    - timestamp: 2026-02-10T16:51:47.02328603Z
-      action: TRANSITION
-      feature: data-models
-      actor: cli
-      result: success
-    - timestamp: 2026-02-10T16:51:51.669778379Z
-      action: APPROVE_ARTIFACT
-      feature: task-management-ui
-      actor: user
-      result: success
-    - timestamp: 2026-02-10T16:52:06.777328748Z
-      action: PASS_ARTIFACT
-      feature: data-models
-      actor: user
-      result: success
-    - timestamp: 2026-02-10T16:52:11.603902771Z
-      action: APPROVE_ARTIFACT
-      feature: task-management-ui
-      actor: user
-      result: success
-    - timestamp: 2026-02-10T16:52:16.856815843Z
-      action: TRANSITION
-      feature: data-models
-      actor: cli
-      result: success
-    - timestamp: 2026-02-10T16:52:22.091515103Z
-      action: TRANSITION
-      feature: task-management-ui
-      actor: cli
-      result: success
-    - timestamp: 2026-02-10T16:52:37.598014959Z
-      action: TRANSITION
-      feature: task-management-ui
-      actor: cli
-      result: success
-    - timestamp: 2026-02-10T16:52:41.844655247Z
-      action: PASS_ARTIFACT
-      feature: data-models
-      actor: user
-      result: success
-    - timestamp: 2026-02-10T16:52:47.480584471Z
-      action: TRANSITION
-      feature: data-models
-      actor: cli
-      result: success
-    - timestamp: 2026-02-10T16:52:57.214081609Z
-      action: PASS_ARTIFACT
-      feature: data-models
-      actor: user
-      result: success
-    - timestamp: 2026-02-10T16:53:02.087426551Z
-      action: TRANSITION
-      feature: data-models
-      actor: cli
-      result: success
-    - timestamp: 2026-02-10T16:53:07.407469679Z
-      action: TRANSITION
       feature: data-models
       actor: cli
       result: success