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New tavolo-briscola distribution implementing briscola on the platform: - pure rules (state.py, engine.py): 3-card deals, a face-up trump that is the last card drawn, trump-first trick resolution (A > 3 > K > H > J > 7 > 6 > 5 > 4 > 2), 120 points per deal, 60-60 patta re-deals, a configurable target score (default 61), deal-end acknowledgements and turn auto-play; - BriscolaEngine (briscola, 2 players) and BriscolaQuattroEngine (briscola_a_quattro, 4 players in fixed partnerships) adapters; - registered in tavolo-app, packaged in the Docker image, documented. Platform fixes surfaced by a two-player lobby: - the websocket state and snapshot payloads now carry seats_open (they were only in the REST lobby payload), so lobbies with player counts other than four render correctly; seats_open is clamped at zero; - the web client logs unparseable server messages instead of silently dropping them. Web client: briscola table for both variants (stock, face-up trump, trick, last-trick banner), deal summary modal and game-over overlay. Tests: tavolo-briscola rules/adapter suites, app integration tests (lobby, websocket play, turn timeout, deal-end acks, persistence), a platform seats_open test and frontend model parsing tests.