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/doc/src/lib.rs

@@ -9,11 +9,13 @@ mod assembly;
 mod document;
 mod eval;
 pub mod expr;
+mod params;
 pub mod project;
 
 pub use assembly::{IDENTITY, Mat, Occurrence, apply_point, apply_vector, is_identity, mat_inverse, mat_mul, rigid};
 pub use document::*;
 pub use eval::{FeatureResult, Model, ModelBody, ModelState, SolvedSketch, ThreadInfo, parse_metric_thread, world_state};
+pub use params::{ParamRow, cycles};
 pub use solvecraft_kernel as kernel;
 pub use solvecraft_sketch as sketch;