[squad:plan] Driftseed testing: determinism, solvability and playtests (Hockney) #69917

Owner: Hockney.

• Add golden-run tests proving the simulation is deterministic.
• Add a solver or replay check that every level is solvable within its tool budget.
• Run a playtest checklist per milestone and cover input edge cases (touch, keyboard, resize).

Done when CI fails on any unsolvable or non-deterministic level.

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