Add a State Hub workplan/wait graph as a Fabric explorer mode.

Coordination is a view, not topology. Open workplans and wait tasks
project into graph-explorer; citation edges recover depends_on from
task prose. UI: /ui/graph-explorer?mode=coordination.

Assistant: grok
Assistant-Session: 01a09dc1-b21e-77e1-919e-fcad2f82b267

tests/test_coordination_graph.py

@@ -0,0 +1,58 @@
+from __future__ import annotations
+
+from railiance_fabric.coordination_graph import coordination_graph_payload
+from railiance_fabric.graph_explorer import fabric_graph_explorer_manifest
+from railiance_fabric.schema_validation import draft202012_validator
+
+
+def _validate_schema(name: str, document: dict) -> None:
+    from pathlib import Path
+
+    schema_path = Path("schemas") / name
+    validator = draft202012_validator(schema_path)
+    validator.validate(document)
+
+
+def test_coordination_payload_filters_open_records_and_cites_wait() -> None:
+    workplans = [
+        {"id": "wp-a", "slug": "cust-wp-0071", "title": "Sizing", "status": "active"},
+        {"id": "wp-b", "slug": "rapps-wp-0014", "title": "Pilot", "status": "active"},
+        {"id": "wp-c", "slug": "done-wp", "title": "Finished", "status": "finished"},
+    ]
+    tasks = [
+        {
+            "id": "t1",
+            "workplan_id": "wp-a",
+            "title": "Measure after RAPPS-WP-0014",
+            "status": "wait",
+            "description": "Await RAPPS-WP-0014 bind",
+            "needs_human": False,
+        },
+        {
+            "id": "t2",
+            "workplan_id": "wp-a",
+            "title": "Closed",
+            "status": "done",
+        },
+        {
+            "id": "t3",
+            "workplan_id": "wp-c",
+            "title": "orphan open on finished wp",
+            "status": "todo",
+        },
+    ]
+    payload = coordination_graph_payload(workplans, tasks)
+    _validate_schema("graph-explorer-payload.schema.yaml", payload)
+    ids = {el["data"]["id"] for el in payload["elements"]}
+    assert "workplan:wp-a" in ids
+    assert "workplan:wp-b" in ids
+    assert "workplan:wp-c" not in ids
+    assert "task:t1" in ids
+    assert "task:t2" not in ids
+    assert "task:t3" not in ids
+    waits = [el for el in payload["elements"] if el["data"].get("edgeType") == "waits_on"]
+    assert waits
+    assert waits[0]["data"]["target"] == "workplan:wp-b"
+    assert payload["metrics"]["open_workplans"] == 2
+    assert "coordination" in {mode["id"] for mode in fabric_graph_explorer_manifest()["modes"]}
+    assert payload["metrics"]["wait_or_human_tasks"] == 1