fix: restore shell and cut wall topology in 0.2.1

crates/doc/src/format.rs

@@ -36,13 +36,16 @@
 //! - 12: persistent analytic offset boundary roles and association profile references.
 //!   Older analytic chains retain their source/output correspondence and saved geometry;
 //!   migration never invents retired entities or renumbers existing curves.
+//! - 13: exact planar shell face anchors retain the shell producer, original certified
+//!   source and distinct inner/outer role. Version 12 anchors retain their identities;
+//!   migration never guesses attachments for older designs.
 
 use serde_json::Value;
 
 use crate::{DocError, Document, Result};
 
 /// The format this build writes.
-pub const FORMAT: u32 = 12;
+pub const FORMAT: u32 = 13;
 
 pub fn format_string(n: u32) -> String {
     format!("solvecraft/{n}")
@@ -55,8 +58,8 @@ pub fn version_of(s: &str) -> Option<u32> {
 
 /// JSON-level upgrades: entry `i` turns format `i + 1` into `i + 2`.
 type JsonStep = fn(&mut Value) -> Result<()>;
-const JSON_STEPS: [JsonStep; 11] =
-    [|_| Ok(()), v2_to_v3, v3_to_v4, v4_to_v5, v5_to_v6, |_| Ok(()), |_| Ok(()), |_| Ok(()), |_| Ok(()), |_| Ok(()), |_| Ok(())];
+const JSON_STEPS: [JsonStep; 12] =
+    [|_| Ok(()), v2_to_v3, v3_to_v4, v4_to_v5, v5_to_v6, |_| Ok(()), |_| Ok(()), |_| Ok(()), |_| Ok(()), |_| Ok(()), |_| Ok(()), |_| Ok(())];
 
 /// Old XZ references retain their exact frame, including nested offset and angled planes.
 /// New origin references use +Y; freezing the old frame avoids changing sketch coordinates,