chore(ACTIVITY-WP-0015): dedupe state_hub_workstream_id frontmatter

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

workplans/ACTIVITY-WP-0015-adopt-statehub-beachhead-endpoint.md

@@ -9,7 +9,7 @@ owner: claude
 topic_slug: activity-core
 created: "2026-06-24"
 updated: "2026-06-24"
-state_hub_workstream_id: ""
+state_hub_workstream_id: "bbc07f9e-9323-4b2b-b556-c33b37d0b228"
 ---
 
 # Adopt State Hub Beachhead Endpoint
@@ -29,7 +29,7 @@ client-side adoption that depends on the state-hub-owned **beachhead** capabilit
 id: ACTIVITY-WP-0015-T01
 status: wait
 priority: medium
-state_hub_task_id: ""
+state_hub_task_id: "76b6132d-394a-4a67-bef6-73bb9d1e277e"
 ```
 
 Once the state-hub beachhead exposes a local endpoint, point activity-core's
@@ -44,7 +44,7 @@ is unreachable. Confirm idempotency-keyed writes dedup on flush (no duplicate
 id: ACTIVITY-WP-0015-T02
 status: wait
 priority: medium
-state_hub_task_id: ""
+state_hub_task_id: "526c2129-cbf7-4531-a319-aebfc75cc6a3"
 ```
 
 Remove the inline `hostNetwork` HTTP proxy `actcore-state-hub-bridge` from