feat(core): make resolveImports optional on AnalyzerPlugin

Update PluginRegistry.resolveImports() to check for plugin.resolveImports
existence before calling it. Non-code plugins (e.g., markdown, dockerfile)
don't need import resolution, so this method is now optional.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

understand-anything-plugin/packages/core/src/__tests__/plugin-registry.test.ts

@@ -178,4 +178,17 @@ describe("PluginRegistry", () => {
     const result = registry.resolveImports("main.py", "import os");
     expect(result).toBeNull();
   });
+
+  it("handles plugins with optional resolveImports (non-code plugins)", () => {
+    const markdownPlugin: AnalyzerPlugin = {
+      name: "markdown",
+      languages: ["markdown"],
+      analyzeFile: () => ({ functions: [], classes: [], imports: [], exports: [] }),
+      // No resolveImports — optional for non-code plugins
+    };
+    const registry = new PluginRegistry();
+    registry.register(markdownPlugin);
+    const result = registry.resolveImports("README.md", "# Hello");
+    expect(result).toBeNull();
+  });
 });

understand-anything-plugin/packages/core/src/plugins/registry.ts

@@ -61,7 +61,7 @@ export class PluginRegistry {
 
   resolveImports(filePath: string, content: string): ImportResolution[] | null {
     const plugin = this.getPluginForFile(filePath);
-    if (!plugin) return null;
+    if (!plugin || !plugin.resolveImports) return null;
     return plugin.resolveImports(filePath, content);
   }