feat(control-plane): compute ERP and analytical workload costs

README.md

@@ -302,13 +302,16 @@ dot -Tsvg target/readme-evidence/selected.dot \
   -o target/readme-evidence/selected.svg
 ```
 
-Candidate discovery accepts the checked-in unquoted templates. Deployment and
-selected-plan inspection require `ASAPQUERY_PLANNING_SNAPSHOT` to point to a
-snapshot with complete, valid workload cost evidence. Prepare that input using
-the [cost evidence workflow](docs/examples/workload-cost-evidence.md).
-There is one snapshot compiler: it compares complete executable alternatives,
-including exact fallback. Materialization IDs are definitions, not physical SIDs.
-For `--metricsql`, collect quotes for the MetricsQL frontend.
+Candidate discovery and deployment accept snapshots without external workload
+quotes. The backend combines applicable ERP resources or analytical estimates
+with data size, query frequency and physical-plan structure, then compares
+complete candidate costs, including exact fallback. The selected plan includes
+the resource breakdown and assumptions in `cost_comparison`.
+
+Point `ASAPQUERY_PLANNING_SNAPSHOT` to your workload snapshot with current data
+and capability inputs. Optional calibrated provider quotes can override automatic
+costing through the [cost evidence workflow](docs/examples/workload-cost-evidence.md).
+Materialization IDs are definitions, not physical SIDs.
 
 ## Prometheus runbook
 

control_plane/src/main.rs

@@ -731,7 +731,7 @@ fn compile_physical_plan_request(
                 )
             }
         },
-        None => frontend.compile(compilation_request, environment),
+        None => physical::workload_cost::select_candidates(candidates, environment, None, frontend),
     };
     let bundle = match compiled {
         Ok(bundle) => bundle,
@@ -986,6 +986,15 @@ mod api_tests {
         let (plan, collectors, _, _, _) =
             compile_physical_plan_request(request, false, QueryFrontend::PromQl).unwrap();
         let plan = plan.unwrap();
+        let report = plan
+            .cost_comparison
+            .as_ref()
+            .expect("HTTP must compare automatically priced candidates");
+        assert_eq!(report.model_version, "backend-workload-resources-v2");
+        assert!(report
+            .candidate_evaluations
+            .iter()
+            .any(|candidate| candidate.automatic_cost.is_some()));
         assert!(collectors.is_empty());
         assert!(plan.collector_plans.is_empty());
         assert_eq!(