Add queryGraph method to SDK MemoryClient

[Copilot]

Adds the missing queryGraph method to the SDK's MemoryClient class to support the graph query endpoint that was added in commit 376ce93.

Changes

• Added queryGraph method to MemoryClient class following the same pattern as other query methods
• Imported graph query schemas (QueryGraphRequest, QueryGraphResponse, queryGraphResponseSchema) from the existing schema module
• Exported query-graph schema from SDK index to make types available to consumers

Usage

import { MemoryClient } from '@marcelsamyn/memory/sdk';

const client = new MemoryClient({ baseUrl: 'http://localhost:3000' });

// Query the knowledge graph
const result = await client.queryGraph({
  userId: 'user123',
  query: 'machine learning',  // optional
  maxNodes: 50               // optional, defaults to 100
});

console.log(result.nodes);  // Array of graph nodes
console.log(result.edges);  // Array of graph edges

Implementation Details

The implementation is minimal and maintains consistency with the existing codebase:

• Uses the same _fetch pattern as other query methods
• Leverages existing schemas for type safety
• No breaking changes to existing functionality

Fixes #21.

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