[squad:plan] Mosswake testing: determinism, solvability and playtests (Hockney) #70867

Owner: Hockney. Add unit tests for growth rules, a solver that verifies every level is solvable and that the star thresholds are achievable, a determinism test (same input gives same output), and a manual playtest checklist per milestone.

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• expires on Oct 22, 2026, 3:59 AM UTC-08:00