memba_arcade_leaderboard_v1 package

Package memba_arcade_leaderboard_v1 is the funds-free, verified-score ledger for the Memba arcade (BARRICADE, Space Invaders, and future games — one realm, boards keyed per game slug). Nothing here trusts a client number: an authorized ATTESTER (the backend verifier's key) re-simulates a submitted input log and attests only the reproduced result. The chain stores the attested result plus a commitment to the log (its sha256) — the log itself stays off-chain; "verified, never trustless" is the public contract.

SAFETY: there is NO banker, NO transfer, and NO OriginSend anywhere — the fund-drain risk class does not apply. The only trust boundary is who may attest (owner ∪ the attester allowlist); every write emits an event. Two buckets never mix: the competitive DAILY BOARD (one best entry per address per game per day, shared seed) and personal TRAINING RECEIPTS (practice runs — a verified flex, never ranked).

The game slug is shape-validated only — there is deliberately NO on-chain game registry: the realm is funds-free, so the worst a typo'd slug can do is fragment a board, and the attester (not the player) authors the slug.