feat: advance LOOP-WP-0002/0003/0004 without activity-core blockers

Document event payload contract, draft disabled ActivityDefinitions for
CI/regulator/registry hygiene, initialize loop health snapshots and
regulator dashboard, record DEC-005 kaizen-stack promotion, and close
supplier-independent workplan tasks.

workplans/LOOP-WP-0003-registry-orientation-hygiene.md

@@ -14,16 +14,16 @@ depends_on:
   - LOOP-WP-0001
 tasks:
   - id: T01
-    status: todo
+    status: done
     title: Define hygiene signals and domain rollout order
   - id: T02
-    status: todo
+    status: done
     title: Create hourly registry gap sweep ActivityDefinition
   - id: T03
-    status: todo
+    status: done
     title: Create scope-analyst orientation task template
   - id: T04
-    status: todo
+    status: done
     title: Integrate state-hub SBOM staleness with hygiene roster
   - id: T05
     status: todo
@@ -100,7 +100,7 @@ hour), not full fleet scan.
 
 ```task
 id: LOOP-WP-0003-T01
-status: todo
+status: done
 priority: high
 state_hub_task_id: "cacc914e-85e6-4067-b39d-cf8a3ae91320"
 ```
@@ -115,7 +115,7 @@ Create:
 
 ```task
 id: LOOP-WP-0003-T02
-status: todo
+status: done
 priority: high
 state_hub_task_id: "7c6b15cd-a5ac-4602-956f-61de72a55fef"
 ```
@@ -150,7 +150,7 @@ reuse-surface establish --publish-check   # when registry touched
 
 ```task
 id: LOOP-WP-0003-T03
-status: todo
+status: done
 priority: medium
 state_hub_task_id: "e8eb2700-8ef5-43fb-8d2e-ec080fa86f6f"
 ```
@@ -165,11 +165,13 @@ file state-hub progress event.
 
 ```task
 id: LOOP-WP-0003-T04
-status: todo
+status: done
 priority: medium
 state_hub_task_id: "09cec748-0bfa-4870-b44f-50813f7ed626"
 ```
 
+Completed 2026-06-18: `signals.yml` sbom_handoff section delegates to weekly-sbom-staleness.
+
 Document handoff with existing `activity-core/weekly-sbom-staleness`:
 
 - Do not duplicate SBOM rescans in this loop