feat(railiance): adopt state-hub edge relay beachhead for WP-0015

Deploy actcore-statehub-edge-relay, point STATE_HUB_URL at it, retire the
bespoke state-hub bridge, and accept edge-relay queued write receipts in
report and ops evidence sinks.

src/activity_core/schedule_health.py

@@ -24,7 +24,7 @@ from uuid import UUID
 import httpx
 
 from activity_core.schedule_manager import schedule_id
-from activity_core.state_hub_write import idempotency_headers
+from activity_core.state_hub_write import idempotency_headers, parse_state_hub_write_response
 
 _DEFAULT_STATE_HUB_URL = "http://127.0.0.1:8000"
 
@@ -187,8 +187,14 @@ def post_missed_fire_alert(
         headers=idempotency_headers("schedule_miss", health.activity_id, last_fired),
         timeout=timeout_seconds,
     )
-    resp.raise_for_status()
-    data = resp.json()
+    data = parse_state_hub_write_response(resp)
+    if data.get("queued"):
+        return {
+            "type": "schedule-miss-alert",
+            "status": "queued",
+            "outbox_id": data.get("outbox_id"),
+            "idempotency_key": data.get("idempotency_key"),
+        }
     return {
         "type": "schedule-miss-alert",
         "status": "posted",