Single Thread, All Units

One thread_id for the game. All 3 units share state. Merge reducers prevent cross-unit overwrites. SqliteSaver serializes writes (fine for turn-based).

Node Functions

• 36 stubs — each calls Hermes -z one-shot, produces output_summary, calls interrupt() for player review
• Factory pattern: make_node_function(hex_id) generates per-hex functions from NODE_DEFS
• Interrupt options: accept, correct, skip, deepen

Hex Adjacency

• Computed from 6×6 flat-top hex grid geometry
• Each hex connects to up to 6 neighbors
• Hex 14 neighbors: 07, 08, 13, 15, 19, 20