docs: session handover — 6D NeuronPrint, loose ends, Rosetta exploration Complete handover prompt for next session: - What was built (serve.rs SPO pipeline, hydrate partitions, neuron.rs, docs) - Key epiphanies (6D = two SPO triads, palette = cleanup memory, golden-step = JL) - Loose ends (DataFusion UDFs, per-role palettes, real model hydration) - Rosetta exploration questions (Q archetype semantics, Gate importance, layer progression) - Architecture map with file paths - 7 commits this session - External references (Hyperprobe, Monosemanticity, SwiGLU, AriGraph) https://claude.ai/code/session_01M3at4EuHVvQ8S95mSnKgtK#78