STATE-WP-0072: remediate remaining workstream HTTP callers

Research sweep captured in research/20260709-workstream-caller-sweep.md.
Migrate dashboard detail tasks query, custodian_cli POST bodies, and
onboarding curl to workplan-first paths; re-capture 8h legacy-meter evidence.

docs/evidence/legacy-meter-weekly-review-20260709.json

@@ -1,12 +1,12 @@
 {
-  "captured_at": "2026-07-08T23:35:18.486286+00:00",
+  "captured_at": "2026-07-08T23:48:41.675130+00:00",
   "api_base": "http://127.0.0.1:8000",
   "workplan": "STATE-WP-0070",
   "retired_interfaces": [],
   "weekly_review": {
-    "generated_at": "2026-07-08T23:35:18.459774Z",
-    "window_start": "2026-07-08T15:35:18.219148Z",
-    "window_end": "2026-07-08T23:35:18.219148Z",
+    "generated_at": "2026-07-08T23:48:41.652056Z",
+    "window_start": "2026-07-08T15:48:41.473474Z",
+    "window_end": "2026-07-08T23:48:41.473474Z",
     "cadence": "weekly",
     "activity_core_handoff": {
       "activity_id": "statehub-legacy-interface-review",