results: Export CSV takes every parameter its description names (set, at, mode, frame, about)

results.export.csv's form listed only nodes and sets, so the parameter check refused the
probe's set, at, mode and frame and the reactions' about point that the command documents.

Co-Authored-By: Claude Opus 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01UhhZMBTviDQxZvwnyP89fo

crates/engine/src/cmd/forms.rs

@@ -1727,7 +1727,12 @@ pub const EXPORT_CSV: &[Field] = &[
     path("path", "File", true).help("The CSV file to write.").req(),
     SOLVED,
     references("sets", "Sets", C::Set).help("Reactions: the sets to sum; the step's BC sets when empty.").hint("the step's BC sets"),
+    xyz("about", "About point", D::Length).help("Reactions: the point moments are taken about."),
     labels("nodes", "Nodes", LabelOf::Node).help("Probe: the node labels."),
+    reference("set", "Set", C::Set).help("Probe: a set whose nodes to read."),
+    points("at", "Points", D::Length, 10_000).help("Probe: points to read at the nearest nodes."),
+    int("mode", "Mode", 1, 1_000_000).help("Probe: the mode to read, for frequency and buckling steps."),
+    int("frame", "Frame", 0, 1_000_000_000).help("Probe: the frame to read, for explicit and transient steps."),
 ];
 pub const REACTIONS: &[Field] = &[
     SOLVED,

crates/engine/src/cmd/results.rs

@@ -621,6 +621,11 @@ mod tests {
         }
         assert!(!rows[0].iter().any(|h| h == "temperature"), "columns the step does not have are left out: {:?}", rows[0]);
         // A stale result is refused.
+        // Every parameter the description names is taken: a set's nodes, points, a moment point.
+        let set = s.execute("results.export.csv", &json!({"what": "probe", "path": path, "step": "Bend", "set": "tip"})).unwrap();
+        assert!(set["rows"].as_u64().unwrap_or(0) > 0, "{set}");
+        s.execute("results.export.csv", &json!({"what": "probe", "path": path, "step": "Bend", "at": [[0, 0, 0]]})).unwrap();
+        s.execute("results.export.csv", &json!({"what": "reactions", "path": path, "step": "Bend", "about": [1, 0, 0]})).unwrap();
         s.execute("mesh.node.add", &json!({"label": 99_999, "xyz": [0, 0, 0]})).unwrap();
         assert!(s.execute("results.export.csv", &json!({"what": "reactions", "path": temp_csv("stale"), "step": "Bend"})).is_err());
         for p in ["reactions", "probe"] {