8 DOF Hand

8-DOF Hand (per-finger flex + abduct) — in progress

Adding palm-back buttons (PCF8574 on the ESP32 I²C bus) for per-finger flex and abduct, recorded as a 14-D action. Groundwork done: schema.ActionV2 (14-D) + STATE_V2 (20-D), and amazing_hand_client send_flex_abduct / read_state (the abduct=0 path is bit-identical to today's curls). Firmware + :8765 protocol (F: command, S: report) spec: docs/amazinghand_esp32_buttons.md. Panel "hand-buttons" recording source lands when the board is wired + flashed. The live pipeline stays 10-D; v2 is opt-in.