# Task ID: 81

**Title:** Define Built-in ProxyModels (default, subindex)

**Status:** done

**Dependencies:** 78 ✓

**Priority:** high

**Description:** Create the built-in proxymodel definitions for 'default' (current behavior) and 'subindex' (hierarchical navigation).

**Details:**

Create `src/mcplocal/src/proxymodel/built-in-models.ts`:

```typescript
import type { ProxyModelDefinition } from './schema';

export function getBuiltInProxyModels(): Map<string, ProxyModelDefinition> {
  const models = new Map<string, ProxyModelDefinition>();
  
  models.set('default', {
    kind: 'ProxyModel',
    metadata: { name: 'default' },
    spec: {
      controller: 'gate',
      controllerConfig: { byteBudget: 8192 },
      stages: [
        { type: 'passthrough' },
        { type: 'paginate', config: { pageSize: 8000 } },
      ],
      appliesTo: ['prompts', 'toolResults'],
      cacheable: false,
    },
  });
  
  models.set('subindex', {
    kind: 'ProxyModel',
    metadata: { name: 'subindex' },
    spec: {
      controller: 'gate',
      controllerConfig: { byteBudget: 8192 },
      stages: [
        { type: 'section-split', config: { minSectionSize: 2000, maxSectionSize: 15000 } },
        { type: 'summarize-tree', config: { maxSummaryTokens: 200, maxGroupSize: 5, maxDepth: 3 } },
      ],
      appliesTo: ['prompts', 'toolResults'],
      cacheable: true,
    },
  });
  
  return models;
}
```

**Test Strategy:**

Unit tests: both models are returned by getBuiltInProxyModels(), 'default' has passthrough+paginate stages, 'subindex' has section-split+summarize-tree stages, both schemas validate correctly.