compat: use simlin_core imports instead of simlin_engine re-exports

The core types (Error, ErrorCode, ErrorKind, Result, Ident, Canonical)
have already been moved to simlin_core and are re-exported from
simlin_engine::common. This change updates simlin-compat to import
these types directly from simlin_core, reducing coupling between
simlin-compat and simlin-engine.

Author: bpowers

src/simlin-compat/src/lib.rs

@@ -38,7 +38,7 @@ pub fn to_xmile(project: &Project) -> Result<String> {
 
 #[cfg(feature = "vensim")]
 pub fn open_vensim(reader: &mut dyn BufRead) -> Result<Project> {
-    use simlin_engine::common::{Error, ErrorCode, ErrorKind};
+    use simlin_core::common::{Error, ErrorCode, ErrorKind};
     use xmutil::convert_vensim_mdl;
 
     let mut contents_buf: Vec<u8> = vec![];

src/simlin-compat/tests/roundtrip.rs

@@ -68,8 +68,8 @@ fn roundtrips_model() {
             }
         }
 
-        assert!(project.models.contains_key(&simlin_engine::common::Ident::<
-            simlin_engine::common::Canonical,
+        assert!(project.models.contains_key(&simlin_core::common::Ident::<
+            simlin_core::common::Canonical,
         >::from_raw("main")));
     }
 }

src/simlin-compat/tests/simulate.rs

@@ -10,7 +10,7 @@ use std::rc::Rc;
 use float_cmp::approx_eq;
 
 use simlin_compat::{load_csv, load_dat, xmile};
-use simlin_engine::common::{Canonical, Ident};
+use simlin_core::common::{Canonical, Ident};
 use simlin_engine::interpreter::Simulation;
 use simlin_engine::serde::{deserialize, serialize};
 use simlin_engine::{Project, Results, Vm, project_io};

src/simlin-compat/tests/simulate_ltm.rs

@@ -10,7 +10,7 @@ use std::rc::Rc;
 use std::result::Result as StdResult;
 
 use simlin_compat::xmile;
-use simlin_engine::common::{Canonical, Ident, canonicalize};
+use simlin_core::common::{Canonical, Ident, canonicalize};
 use simlin_engine::interpreter::Simulation;
 use simlin_engine::{Project, Results, Vm, ltm};