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.

crates/gateway/src/v1/iterate.rs

@@ -90,7 +90,7 @@ pub struct IterateFailure {
 }
 
 pub async fn iterate(
-    State(state): State<super::V1State>,
+    State(_state): State<super::V1State>,
     Json(req): Json<IterateRequest>,
 ) -> impl IntoResponse {
     let max_iter = req.max_iterations.unwrap_or(DEFAULT_MAX_ITERATIONS).max(1);