test(issue-5): add layer-1 herdr and layer-2 watcher test fixtures

tests/fixtures/issue_5/watcher/tool_running.json

@@ -0,0 +1,48 @@
+{
+  "schema_version": "1.0.0",
+  "scenario_id": "tool_running",
+  "backend": "backend_agnostic",
+  "provenance": "simulated",
+  "description": "Native status working or interactive_ready with active background tool execution. Inferred completion must be held.",
+  "dispatch_context": {
+    "job_id": "test-job-tool-running-01",
+    "attempt_id": 1,
+    "agent_session_uuid": "1c53dd89-81fc-49a6-b15e-bef3dfb61697",
+    "pane_process_generation": "w2X:p3:5678:2026-09-06T00:00:00Z",
+    "dispatch_ack": true,
+    "execution_anchor_observed": true
+  },
+  "timeline": [
+    {
+      "collector_clock_id": "CLOCK_MONOTONIC",
+      "relative_ms": 0,
+      "source_kind": "herdr",
+      "source_provenance": "simulated",
+      "payload": {
+        "agent_status": "working",
+        "interactive_ready": true
+      }
+    },
+    {
+      "collector_clock_id": "CLOCK_MONOTONIC",
+      "relative_ms": 200,
+      "source_kind": "harness",
+      "source_provenance": "simulated",
+      "payload": {
+        "tool": "bash",
+        "active": true,
+        "command": "pytest"
+      }
+    }
+  ],
+  "filesystem": {
+    "report_path": ".mam/jobs/test-job-tool-running-01/report-final.md",
+    "exists": false,
+    "manifest_committed": false
+  },
+  "expected_policy": {
+    "decision": "hold",
+    "reason": "external tool execution currently active",
+    "policy_version": "2.0.0"
+  }
+}