ops: persist runtime fixes — iterate.rs unused state, catalog cleanup

Two load-bearing runtime changes that were never committed:

1. crates/gateway/src/v1/iterate.rs — `state` → `_state` on the unused
   route-state parameter. Cleared the one cargo workspace warning.
   Fix was made earlier this session but the working-tree change
   never made it into a commit.

2. data/_catalog/manifests/564b00ae-cbf3-4efd-aa55-84cdb6d2b0b7.json —
   DELETED. This was the dead manifest for `client_workerskjkk`, a
   typo dataset whose parquet was deleted but whose catalog entry
   stayed registered. Every SQL query failed schema inference on the
   missing file before reaching its target table — that's the bug
   that made /system/summary report 0 workers and the demo show zero
   bench. Deleting the manifest keeps the fix on disk; committing
   the deletion keeps it in git so a fresh checkout doesn't regress.

3. data/_catalog/manifests/32ee74a0-59b4-4e5b-8edb-70c9347a4bf3.json
   — runtime catalog metadata update from the successful_playbooks_live
   write path. Ride-along change.

Reports under reports/distillation/phase[68]-*.md are auto-regenerated
by the audit cycle each run; skipping those.

data/_catalog/manifests/32ee74a0-59b4-4e5b-8edb-70c9347a4bf3.json

@@ -11,15 +11,51 @@
     }
   ],
   "created_at": "2026-04-20T11:07:57.308050648Z",
-  "updated_at": "2026-04-22T03:28:28.343843823Z",
+  "updated_at": "2026-04-28T01:28:31.280305207Z",
   "description": "",
   "owner": "",
   "sensitivity": null,
-  "columns": [],
+  "columns": [
+    {
+      "name": "timestamp",
+      "data_type": "Utf8",
+      "sensitivity": null,
+      "description": "",
+      "is_pii": false
+    },
+    {
+      "name": "operation",
+      "data_type": "Utf8",
+      "sensitivity": null,
+      "description": "",
+      "is_pii": false
+    },
+    {
+      "name": "approach",
+      "data_type": "Utf8",
+      "sensitivity": null,
+      "description": "",
+      "is_pii": false
+    },
+    {
+      "name": "result",
+      "data_type": "Utf8",
+      "sensitivity": null,
+      "description": "",
+      "is_pii": false
+    },
+    {
+      "name": "context",
+      "data_type": "Utf8",
+      "sensitivity": null,
+      "description": "",
+      "is_pii": false
+    }
+  ],
   "lineage": null,
   "freshness": null,
   "tags": [],
-  "row_count": null,
+  "row_count": 2077,
   "last_embedded_at": null,
   "embedding_stale_since": null,
   "embedding_refresh_policy": null