ARCHIVED [experiment over]: An AI agent built to do Ralph loops - plan mode for planning and ralph mode for implementing.

feat(graph): session management with deterministic handoff notes master

- Add Session struct and SessionStore for managing work periods - Implement create_session, end_session, get_latest_session, list_sessions methods - Generate deterministic handoff notes from graph state in BEGIN IMMEDIATE transaction - Handoff notes contain Done, Remaining, Blocked, Decisions Made sections - Add comprehensive tests verifying all AC1.x acceptance criteria - Tests pass: 6/6 Verifies P1c.AC1.1-1.4


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