Wickra Impact is pre-1.0; the surface may change before the first release.

• The order-book-walk fill engine over the inherited wickra-backtest types.
• The command_json boundary and the reference CLI.
• The ten language bindings, the golden corpus and the full CI matrix.

• Additional impact models beyond the level-walk (square-root / power-law market-impact curves).
• Per-order impact decay and temporary-vs-permanent impact split.
• Partial-fill and time-in-force handling against the recorded book.

• A first tagged release published across the language registries (USER-GO).

Nothing here is a commitment; priorities follow real use.