fix: remove unused imports in test files (CI typecheck)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: Dchuong03

packages/shared/src/knowledge/chunker.test.ts

@@ -5,7 +5,7 @@
  * No mocks needed — tests markdown-aware semantic chunking logic.
  */
 import { describe, it, expect } from 'vitest';
-import { chunkDocument, type KnowledgeChunk } from './chunker';
+import { chunkDocument } from './chunker';
 import { makeTestDoc, repeat } from './__test-utils';
 
 // =============================================================================

packages/shared/src/knowledge/hybrid-search.test.ts

@@ -4,7 +4,7 @@
  * Tests RRF fusion, graph enrichment, and RAG context building
  * by mocking both SidMemoClient and SidStackApiClient.
  */
-import { describe, it, expect, vi, beforeEach } from 'vitest';
+import { describe, it, expect, vi } from 'vitest';
 import { hybridSearch, buildRAGContext } from './hybrid-search';
 import { makeMockSidMemoClient, makeMockApiClient } from './__test-utils';