diff --git a/src/domain/analysis/impact.ts b/src/domain/analysis/impact.ts
index 5cd25214..933178fb 100644
--- a/src/domain/analysis/impact.ts
+++ b/src/domain/analysis/impact.ts
@@ -7,6 +7,5 @@
  * - presentation/diff-impact-mermaid.ts: diffImpactMermaid (Mermaid diagram generation)
  */
 
-export { diffImpactMermaid } from '../../presentation/diff-impact-mermaid.js';
 export { diffImpactData } from './diff-impact.js';
 export { bfsTransitiveCallers, fnImpactData, impactAnalysisData } from './fn-impact.js';
diff --git a/src/domain/queries.ts b/src/domain/queries.ts
index b35ad981..aae22eaf 100644
--- a/src/domain/queries.ts
+++ b/src/domain/queries.ts
@@ -8,6 +8,7 @@
 
 // ── Re-export from dedicated module for backward compat ───────────────────
 export { isTestFile, TEST_PATTERN } from '../infrastructure/test-filter.js';
+export { diffImpactMermaid } from '../presentation/diff-impact-mermaid.js';
 export { iterListFunctions, iterRoles, iterWhere } from '../shared/generators.js';
 // ── Kind/edge constants (canonical source: kinds.js) ─────────────────────
 export {
@@ -28,7 +29,6 @@ export { fileDepsData, fnDepsData, pathData } from './analysis/dependencies.js';
 export { exportsData } from './analysis/exports.js';
 export {
   diffImpactData,
-  diffImpactMermaid,
   fnImpactData,
   impactAnalysisData,
 } from './analysis/impact.js';
diff --git a/src/features/structure-query.ts b/src/features/structure-query.ts
index 3e2509f4..dfec638c 100644
--- a/src/features/structure-query.ts
+++ b/src/features/structure-query.ts
@@ -379,6 +379,8 @@ function getSortFn(sortBy: string): (a: DirRow, b: DirRow) => number {
         const db_ = (b.file_count ?? 0) > 0 ? (b.symbol_count || 0) / (b.file_count ?? 1) : 0;
         return db_ - da;
       };
+    case 'files':
+      return (a, b) => (b.file_count || 0) - (a.file_count || 0);
     default:
       return (a, b) => a.name.localeCompare(b.name);
   }
diff --git a/tests/unit/visitor.test.ts b/tests/unit/visitor.test.ts
index 62dc5b3e..992b4307 100644
--- a/tests/unit/visitor.test.ts
+++ b/tests/unit/visitor.test.ts
@@ -4,6 +4,7 @@
 import { describe, expect, it } from 'vitest';
 
 // We need a tree-sitter tree to test. Use the JS parser.
+// biome-ignore lint/suspicious/noExplicitAny: tree-sitter parser type is complex and not worth typing for tests
 let parse: any;
 
 async function ensureParser() {