EVOLUTION — Per-compiler default-variant timeline of mainnet submissions. A
preview chip appears only while a submission targets a protocol version mainnet has not activated; none does today.
Compilers with fewer than two mainnet versions are omitted (no improvement signal).
Note: a CAPE preview version is not the Cardano preview testnet. Alternative variants (plain, asdata, prepacked, exbudget, size, tailrec) live in the per-scenario report.
