Parameters: unit-aware parameters (an inch parameter reads bare numbers as inches), atan2/mod/trunc and clearer unit errors, cycle paths (a → b → a), rename with every reference following (expressions, feature inputs, dimensions, favourites, comments), deletes refused with the list of users, parameter errors shown on the features using them, parameters.add/rename/delete/comment/users/graph/complete and expr.evaluate; ChangeParameterCommand renames and favourites; hostile test no longer writes stray files

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AS5Tn3xieewUSg3uxrMVdL

crates/doc/src/tests.rs

@@ -258,6 +258,9 @@ fn parameter_cycles_are_found() {
     ];
     let c = crate::cycles(&list);
     assert_eq!(c.into_iter().collect::<Vec<_>>(), vec!["a", "b", "c", "e"]);
-    let (vals, errs) = crate::expr::eval_params(&list);
+    let defs: Vec<crate::expr::ParamDef> =
+        list.iter().map(|(n, e, _)| crate::expr::ParamDef { name: n.clone(), expr: e.clone(), unit: "mm".into() }).collect();
+    let (vals, errs) = crate::expr::eval_params(&defs, 1.0);
+    assert!(errs["a"].contains("circular reference: a → b → c → a"), "{}", errs["a"]);
     assert!(vals.contains_key("d") && errs.contains_key("a") && errs.contains_key("e"));
 }