feat: add rendering-primitives crate, share non_import_rels across renderers

crates/adapters/ascii/Cargo.toml

@@ -6,5 +6,6 @@ publish = false
 
 [dependencies]
 archlens-domain.workspace = true
+archlens-rendering-primitives.workspace = true
 thiserror.workspace = true
 tracing.workspace = true

crates/adapters/ascii/src/ascii_renderer.rs

@@ -2,6 +2,7 @@ use archlens_domain::{
     CodeElement, CodeGraph, DomainError, RelationshipKind, RenderOutput, RenderedFile,
     ports::DiagramRenderer,
 };
+use archlens_rendering_primitives::non_import_rels;
 
 pub struct AsciiRenderer;
 
@@ -94,16 +95,12 @@ impl DiagramRenderer for AsciiRenderer {
             lines.push("└───".to_string());
         }
 
-        let non_import_rels: Vec<_> = graph
-            .relationships()
-            .iter()
-            .filter(|r| r.kind() != RelationshipKind::Import)
-            .collect();
+        let filtered_rels: Vec<_> = non_import_rels(graph.relationships()).collect();
 
-        if !non_import_rels.is_empty() {
+        if !filtered_rels.is_empty() {
             lines.push(String::new());
             lines.push("── Relationships ──".to_string());
-            for rel in &non_import_rels {
+            for rel in &filtered_rels {
                 let arrow = match rel.kind() {
                     RelationshipKind::Inheritance => "extends",
                     RelationshipKind::Composition => "has",