V2 P0: MCP cortex_explain_memory tool

[cursor]

Background

V2 MCP surface: agents need explainability for claims (evidence, temporal validity, authority).

Problem Statement

MCP only exposes query / inject / remember — no explain tool.

Proposed Solution

• Add cortex_explain_memory calling the Evidence explain API
• Return: belief, supporting/conflicting evidence, temporal validity, authority, confidence

Acceptance Criteria

• Tool registered in mcp/server.js
• Tests (related: MCP server automated test suite and CI job #31 MCP test suite)
• Documented in README MCP block

Depends on

Evidence Graph explain API

Plan ref

V2 §14 MCP / Agent Interface