feat(cliproxy): add pinned model routing prefixes

tests/unit/cliproxy/model-routing-hints.test.ts

@@ -0,0 +1,64 @@
+import { describe, expect, it } from 'bun:test';
+import {
+  buildCliproxyRoutingHints,
+  getManagedModelPrefix,
+} from '../../../src/shared/cliproxy-model-routing';
+
+describe('cliproxy model routing hints', () => {
+  it('uses short managed prefixes for overlapping Gemini and Antigravity models', () => {
+    const routing = buildCliproxyRoutingHints(
+      {
+        gemini: {
+          provider: 'gemini',
+          displayName: 'Gemini',
+          models: [{ id: 'gemini-3-flash-preview', name: 'Gemini Flash' }],
+        },
+        agy: {
+          provider: 'agy',
+          displayName: 'Antigravity',
+          models: [{ id: 'gemini-3-flash', name: 'Gemini 3 Flash' }],
+        },
+      },
+      [
+        { id: 'gemini-3-flash-preview', owned_by: 'antigravity', type: 'antigravity' },
+        { id: 'gemini-3-flash', owned_by: 'antigravity', type: 'antigravity' },
+      ]
+    );
+
+    expect(getManagedModelPrefix('gemini')).toBe('gcli');
+    expect(getManagedModelPrefix('agy')).toBe('agy');
+
+    expect(routing.gemini?.models[0]).toMatchObject({
+      recommendedModelId: 'gcli/gemini-3-flash-preview',
+      unprefixedStatus: 'shadowed',
+      effectiveProvider: 'agy',
+      effectiveDisplayName: 'Antigravity',
+    });
+
+    expect(routing.agy?.models[0]).toMatchObject({
+      recommendedModelId: 'agy/gemini-3-flash',
+      unprefixedStatus: 'safe',
+      effectiveProvider: 'agy',
+    });
+  });
+
+  it('marks models as prefix-only when they are not advertised unprefixed', () => {
+    const routing = buildCliproxyRoutingHints(
+      {
+        gemini: {
+          provider: 'gemini',
+          displayName: 'Gemini',
+          models: [{ id: 'gemini-3.1-pro-preview', name: 'Gemini 3.1 Pro' }],
+        },
+      },
+      []
+    );
+
+    expect(routing.gemini?.prefixOnlyCount).toBe(1);
+    expect(routing.gemini?.models[0]).toMatchObject({
+      recommendedModelId: 'gcli/gemini-3.1-pro-preview',
+      unprefixedStatus: 'prefix-only',
+      effectiveProvider: null,
+    });
+  });
+});