fix: remove unused FilePath import, mark Import arm unreachable in ascii

crates/adapters/ascii/src/ascii_renderer.rs

@@ -104,7 +104,7 @@ impl DiagramRenderer for AsciiRenderer {
                 let arrow = match rel.kind() {
                     RelationshipKind::Inheritance => "extends",
                     RelationshipKind::Composition => "has",
-                    RelationshipKind::Import => "imports",
+                    RelationshipKind::Import => unreachable!("imports filtered by non_import_rels"),
                 };
                 lines.push(format!(
                     "  {} ─[{}]─> {}",

crates/adapters/rendering-primitives/tests/rendering_primitives_tests.rs

@@ -1,5 +1,5 @@
 use archlens_domain::{
-    FilePath, Relationship, RelationshipKind,
+    Relationship, RelationshipKind,
 };
 use archlens_rendering_primitives::{non_import_rels, sanitize_identifier};