cargo run -r -p local-test
cd crates/oled-test
cargo run -r -Zjson-target-spec
PA2 = JUMP
PC4 = MOVE LEFT
PD4 = MOVE RIGHT
PC1 = OLED I2C SDA
PC2 = OLED I2C SCL
PD6 = TX UART (debugging)
$ claude mcp add ch32-game-rust \
-- python -m otcore.mcp_server <graph>