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

src/routing/policy.test.ts

@@ -0,0 +1,50 @@
+import { describe, it, expect } from 'vitest';
+import { RoutingPolicy } from './policy.js';
+
+describe('RoutingPolicy', () => {
+  it('uses default path when disabled', () => {
+    const policy = new RoutingPolicy({
+      enabled: false,
+      fastPathThreshold: 0.8,
+      llmThreshold: 0.4,
+      defaultPath: 'llm',
+    });
+
+    expect(policy.decide({ confidence: 0.99 })).toEqual({ path: 'llm', reason: 'disabled' });
+  });
+
+  it('routes to fast at or above fast threshold', () => {
+    const policy = new RoutingPolicy({
+      enabled: true,
+      fastPathThreshold: 0.8,
+      llmThreshold: 0.4,
+      defaultPath: 'llm',
+    });
+
+    expect(policy.decide({ confidence: 0.8 })).toEqual({ path: 'fast', reason: 'high_confidence' });
+    expect(policy.decide({ confidence: 0.95 })).toEqual({ path: 'fast', reason: 'high_confidence' });
+  });
+
+  it('routes to llm at or below llm threshold', () => {
+    const policy = new RoutingPolicy({
+      enabled: true,
+      fastPathThreshold: 0.8,
+      llmThreshold: 0.4,
+      defaultPath: 'fast',
+    });
+
+    expect(policy.decide({ confidence: 0.4 })).toEqual({ path: 'llm', reason: 'low_confidence' });
+    expect(policy.decide({ confidence: 0.1 })).toEqual({ path: 'llm', reason: 'low_confidence' });
+  });
+
+  it('uses default path between thresholds', () => {
+    const policy = new RoutingPolicy({
+      enabled: true,
+      fastPathThreshold: 0.8,
+      llmThreshold: 0.4,
+      defaultPath: 'llm',
+    });
+
+    expect(policy.decide({ confidence: 0.6 })).toEqual({ path: 'llm', reason: 'mid_confidence' });
+  });
+});