Sketch projection: Project (edges, face loops, body silhouettes, vertices, other sketches' curves and points, origin, axes, planes), Intersect (body/face/edge section with the sketch plane) and Include 3D Geometry as linked reference geometry: fixed, purple, re-resolved on every recompute (follows upstream edits, keeps ids when the shape is unchanged, flagged when the reference is lost), usable in profiles, constraints and dimensions; Break Link; sketching on a face auto-projects its edges (sketch.auto_project); drawing on a model vertex or edge projects it

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

crates/engine/src/lib.rs

@@ -147,6 +147,8 @@ pub struct Session {
     pub log: Vec<String>,
     /// Increments on every document change (views use it to refresh).
     pub revision: u64,
+    /// Project a face's edges into a sketch created on it (Fusion's default; `sketch.auto_project`).
+    pub auto_project: bool,
 }
 
 const MAX_UNDO: usize = 200;
@@ -174,6 +176,7 @@ impl Session {
             path: None,
             log: Vec::new(),
             revision: 1,
+            auto_project: true,
         }
     }
 
@@ -264,6 +267,7 @@ impl Session {
             saved: self.saved.clone(),
             log: Vec::new(),
             revision: self.revision,
+            auto_project: self.auto_project,
         }
     }