jev-blocks

Edit blocks.json to set gravity, speedup, decisionMs, moveMs, garbageRows, piece weights, an optional custom board, and a style line. Fix the seed, set speedup to 0, change one knob at a time, and let the game run about a minute per setting.

Read .harness/verdict.json after each run and check the timing finding, which reports how many of the last 50 pieces landed short of target at a given rows-per-second rate. The last clean setting and the first failing one define the breaking point.

Gravity is the fall speed in rows per second, decisionMs is the cost per decision, and moveMs is the cost per rotate or shift. A placement needs roughly decisionMs plus (moves + 1) times moveMs, and the piece locks wherever it is when time runs out.

The pane shows MOCK when no API key is configured, meaning a fixed offline heuristic is making decisions instead of the live model. It proves the plumbing works but does not reflect real model performance, so always state which mode you measured.

Run node "$JEV_DSH/toolchain/check.mjs" to validate the configuration. It prints ok or one error line per problem, such as numbers out of range, all-zero weights, or board rows that are not exactly 10 characters of '.' and '#'.