MCP tools

The MCP surface is read-first and focused on project context.

Tool	Purpose
`memory_query`	Ask a project question and return answers with citations.
`memory_resume`	Generate a continuation briefing.
`memory_up_to_speed`	Generate a new-agent briefing.
`memory_overview`	Inspect counts and project state.
`memory_list_memories`	Browse memory rows.
`memory_get_memory`	Inspect one memory.
`memory_memory_history`	Read memory version history.
`memory_list_activities`	Inspect activity events.
`memory_list_replacement_proposals`	Review pending proposals without approving them.

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