feat(core): add command, intent, and routing primitives

src/session/indexer.test.ts

@@ -0,0 +1,21 @@
+import { describe, it, expect } from 'vitest';
+import { SessionIndexer, tokenize } from './indexer.js';
+
+describe('session indexer', () => {
+  it('tokenizes text with stopword filtering', () => {
+    const tokens = tokenize('Deploy the backend service to production and verify logs');
+    expect(tokens).toContain('deploy');
+    expect(tokens).toContain('backend');
+    expect(tokens).toContain('service');
+    expect(tokens).not.toContain('the');
+  });
+
+  it('extracts top keywords and topics', () => {
+    const indexer = new SessionIndexer({ maxKeywords: 5 });
+    const metadata = indexer.indexText('deploy deploy backend service backend api release');
+
+    expect(metadata.keywords.length).toBeLessThanOrEqual(5);
+    expect(metadata.keywords).toContain('deploy');
+    expect(metadata.topics.length).toBeLessThanOrEqual(3);
+  });
+});