Parameters engine: feature inputs as named model parameters (dN, editable, referenceable), parameters table with sources, values, dependencies (uses/used by) and cycles, favourites, comments, CSV/JSON export and import; more units (inch, mil, yd, km, nm) and functions (exp, ln, log, sign, pow, hypot)

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

crates/engine/src/cmd/features.rs

@@ -240,6 +240,7 @@ fn add_feature(s: &mut Session, p: &Value, kind: FeatureKind) -> Result<Value> {
     let mut kind = kind;
     super::component::to_active_frame(s, &mut kind);
     let id = s.doc_mut().add_feature(kind, name)?;
+    s.doc_mut().name_feature_inputs(id);
     let comp = s.active_component;
     if comp != 0
         && let Some(f) = s.doc_mut().feature_mut(id)