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

src/context/weighting.test.ts

@@ -0,0 +1,46 @@
+import { describe, it, expect } from 'vitest';
+import { rankMessagesByImportance, scoreMessageImportance, selectImportantMessages } from './weighting.js';
+import type { Message } from '../models/types.js';
+
+describe('weighting', () => {
+  it('scores low-value chatter lower than preference and tool outcomes', () => {
+    const chatter: Message = { role: 'user', content: 'hello there' };
+    const preference: Message = { role: 'user', content: 'I prefer concise bullet points in responses.' };
+    const outcome: Message = { role: 'assistant', content: 'Command succeeded with exit code 0. Output saved.' };
+
+    const chatterScore = scoreMessageImportance(chatter);
+    const preferenceScore = scoreMessageImportance(preference);
+    const outcomeScore = scoreMessageImportance(outcome);
+
+    expect(preferenceScore).toBeGreaterThan(chatterScore);
+    expect(outcomeScore).toBeGreaterThan(chatterScore);
+  });
+
+  it('applies recency as a small tie-break boost', () => {
+    const messages: Message[] = [
+      { role: 'user', content: 'simple note' },
+      { role: 'user', content: 'simple note' },
+    ];
+
+    const ranked = rankMessagesByImportance(messages);
+    expect(ranked[1].score).toBeGreaterThan(ranked[0].score);
+  });
+
+  it('selects important messages above threshold and keeps original order', () => {
+    const messages: Message[] = [
+      { role: 'user', content: 'hello' },
+      { role: 'user', content: 'I prefer markdown tables for reports.' },
+      { role: 'assistant', content: 'Tool result: command failed with exit code 1' },
+      { role: 'assistant', content: 'ok' },
+    ];
+
+    const selected = selectImportantMessages(messages, {
+      threshold: 0.45,
+      maxMessages: 4,
+    });
+
+    expect(selected).toHaveLength(2);
+    expect(selected[0].index).toBe(1);
+    expect(selected[1].index).toBe(2);
+  });
+});