staged

OpenAI's signature build screen: a credit ledger that issues GPU-hours, spends them, and lets unused grants lapse in issue order. The trap is charging against the right grant first. Here is the FIFO-by-expiry design that holds up through every follow-up.

The rotting-oranges family of build screens: a state expands outward one step per tick across a grid, with the spec adding rules each round. The signal is multi-source BFS processed by layers, not per-cell loops. Here is the design that absorbs each new test case.