Linked Issue

Closes #3322

Description

The MCP server's add_memories tool always used infer=True when calling memory_client.add(), with no way for MCP clients to control LLM fact extraction. This caused memories about third parties to lose their subject (e.g., "Bob has a PhD" → "has a PhD"), making them unusable.

This adds an infer parameter (default True) to the MCP add_memories tool and passes it through to memory_client.add(). This brings the MCP API to parity with the REST API (which already supports infer since #3607). The tool description is also updated to document the parameter for MCP clients.

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Refactor (no functional changes)
• Documentation update

Breaking Changes

N/A

Test Coverage

• I added/updated unit tests
• I added/updated integration tests
• I tested manually (describe below)
• No tests needed (explain why)

Verified that the infer parameter is accepted in the function signature and correctly forwarded to memory_client.add(). The change is minimal (3 lines) and mirrors the existing REST API behavior.

Checklist

• My code follows the project's style guidelines
• I have performed a self-review of my code
• I have added tests that prove my fix/feature works
• New and existing tests pass locally
• I have updated documentation if needed