CUST-WP-0055 T05: workplan-first progress scope in sinks and resolvers

Prefer workplan_id in State Hub progress writes while dual-writing
workstream_id for wire-compat. Extend schedule_health, evidence/report
sinks, phase5 checks, k8s triage prose, and SCOPE terminology.

tests/test_schedule_health.py

@@ -4,7 +4,9 @@ from __future__ import annotations
 
 from datetime import datetime, timedelta, timezone
 
-from activity_core.schedule_health import evaluate_schedule_health
+import httpx
+
+from activity_core.schedule_health import evaluate_schedule_health, post_missed_fire_alert
 
 NOW = datetime(2026, 6, 23, 12, 0, tzinfo=timezone.utc)
 
@@ -70,6 +72,35 @@ def test_no_fire_recorded_for_due_schedule_is_unhealthy() -> None:
     assert "no recorded fire" in health.reasons[0]
 
 
+def test_post_missed_fire_alert_dual_writes_workplan_scope(monkeypatch) -> None:
+    posts: list[dict] = []
+
+    class _Resp:
+        def raise_for_status(self) -> None: ...
+        def json(self) -> dict[str, str]:
+            return {"id": "progress-1"}
+
+    monkeypatch.setattr(httpx, "post", lambda url, **kwargs: posts.append(kwargs) or _Resp())
+
+    health = evaluate_schedule_health(
+        activity_id="daily",
+        missed_catchup_window=1,
+        last_fired_at=NOW - timedelta(days=2),
+        now=NOW,
+        expected_interval=timedelta(days=1),
+    )
+    result = post_missed_fire_alert(
+        health,
+        state_hub_url="http://state-hub.test",
+        workplan_id="wp-123",
+    )
+
+    assert result["status"] == "posted"
+    body = posts[0]["json"]
+    assert body["workplan_id"] == "wp-123"
+    assert body["workstream_id"] == "wp-123"
+
+
 def test_no_interval_and_no_fire_is_not_flagged() -> None:
     # Without an expected interval we cannot assert a miss from absence alone.
     health = evaluate_schedule_health(